AGC Fanfare range of Wa units Transformer 240v AC 1.2ohms Secondary Circuit AGC Fanfare range of Wa units Transformer 240v AC 20 ohms Primary Circuit AGC Fanfare range of Wa units Fan 30 ohms 

Alpha 240 XE Fan 35 ohms PCB Terminals 16-19 

Alpha 240/240Eco/240E Modureg 40 ohms 

Alpha 240P Fan 130 ohms PCBTerminals 16-17 

Alpha 240P Fan 150 ohms PCBTerminals 17-19 

Alpha 240P Modureg 40 ohms 

Alpha 240P Fan 50 ohms PCBTerminals 16-19 

Alpha 240X Fan 130 ohms PCBTerminals 16-17 

Alpha 240X Fan 150 ohms PCBTerminals 17-19 

Alpha 240X Fan 50 ohms PCBTerminals 16-19 

Alpha 240XP/240XE/240X Modureg 40 ohms 

Alpha 280E / 280P Modureg 40 ohms 

Alpha 280P Fan 130 ohms PCBTerminals 16-17 

Alpha 280P Fan 150 ohms PCBTerminals 17-19 

Alpha 280P Fan 50 ohms PCBTerminals 16-19 

Alpha 500E Modureg 40 ohms 

Alpha CB 25 Gas Valve 240v AC V1 2.7 k, V2 18.8 k Note: Gas Valve Lead contains a DC Rectifier Alpha CB 25Fan 240v AC 

Alpha CB 33 Gas Valve 240v AC V1 2.7 k, V2 18.8 k Note: Gas Valve Lead contains a DC Rectifier Alpha CB 33Fan 240v AC 

Alpha CD18R Gas Valve 240v AC V1 1882 k , V2 1882 k Note: Gas Valve Lead contains a DC Rectifier Alpha CD18R Fan DC Voltage 

Ariston Compact 400 20/1MFS Diverter Valve 1.7 k 

Ariston Compact 400 20/1MFS Modureg 125 ohms 

Ariston Compact 400 20/1MFS Pump 240v AC 140 ohms 

Ariston Compact 400 20/1MFS Fan 360 ohms 

Ariston Compact 400 20/1MFS Gas Valve 4 k Upper 

Ariston Compact 400 20/1MFS Gas Valve 870 ohms Lower 

Ariston Eco Genus Fan Red - Blue 12v DC Black - Brown 325v DC 

Ariston Euro CombiPump >190 ohms 

Ariston Euro CombiModureg 127 ohms 

Ariston Euro CombiFan 45 ohms 

Ariston Euro CombiGas Valve 870 ohms EV1 & EV2 

Ariston Micro Genus 23MFFI, Micro Genus 27MFFI Gas Valve 5.8 k & 19.2 k Baxi HE 

Fan 240v AC 33 ohms Pins 9-18 

Baxi HE 

Gas Valve 4.15 k (EV1 = 2.79 Kohms - EV2 = 1.36 Kohms) 

Baxi HE 

Fan 325v DC (240v Ac from PCB) Pin 24 

Baxi Bahama Gas Valve 6 kPins 1-3 

Baxi Bahama Gas Valve 7k Pins1-4 

Baxi Bermuda 51/5 Gas Valve 1.6 k Pins 1-2

Baxi Bermuda 51/5 Gas Valve 2.8 k Pilotsolenoid (pins 4-5) 

Baxi Brazillia 1500E convector htr Resistor 200 ohms 

Baxi Combi 105E, Combi instant 105E Modureg 40 ohms 

Baxi Combi 80E, Combi 80 Maxflue Modureg 40 ohms 

Baxi DUO TEC/Platinum Fan 230v AC 160 

Baxi DUO TEC/Platinum Pump 230vAC 

Baxi DUO TEC/Platinum Diverter Valve 230vAC Black = N, Red = HW, White = CH Baxi DUO TEC/Platinum Gas valve 230vAC 7.4k 

Baxi DUO TEC/Platinum Spark Gen aprox 100vDC 

Baxi Gasflame Bulb resistor 47 ohms 

Baxi Gasflame,super, ws,ws super,wl Bulb resistor 207 ohms 

Baxi Genesis 80 & 96 Diverter Valve Approx 15 Volts between pins 3 (white wire) + pin 6 (yellow) Note: voltage is only there for a second 

Baxi Genesis 80 & 96 Diverter Valve Approx 24 Volts between pins 4 (white) + pin 5 (orange) Note: voltage is only there for a second 

Baxi Power Max HE Diverter Valve Blue - N, Black - 240V AC on CH, Brown - 240V AC on HW Baxi Power Max HE Fan 325V DC 114 Yellow - Blue 

Baxi Solaire,Ebony,Arena,Baroque Bulb resistor 68 ohms 

Baxi Solo 2 & PP3Series Gas Valve 1.5 k Pilotsolenoid 

Baxi Solo 2 & PP3Series Gas Valve 5 k 

Baxi Solo HE Fan 325v DC 115 

Baxi Solo HE Gas Valve aprox 230vAC 4k 

Baxi SoloPF3Fuse rating 5Amp 

Baxi System 35/60, 60/80 Modureg 40 ohms 

Biasi 120 MFS& 124 MFSModureg 125 ohms Gas Valve SIT 827 

Biasi 120 MFS& 124 MFSModureg 125 ohms Gas valve SIT 837 

Biasi 120 MFS& 124 MFSGas Valve 4 k SIT 827 Upper Coil 

Biasi 120 MFS& 124 MFSGas Valve 850 ohms SIT 827 Lower Coil 

Biasi 120 MFS& 124 MFSGas Valve 9 k SIT 837 Upper Coil 

Biasi 120 MFS& 124 MFSGas Valve 900 ohms SIT 837 Lower Coil 

Biasi Concept 400 Diverter Valve 1.7 k 

Biasi Concept 400 Gas Valve 870 ohms Lower Operator 

Biasi Parva M90 24S & 28S Fan 55 ohms 

Biasi Parva M90 24S & 28S Gas Valve 6.4 k Lower Coil 

Biasi Parva M90 24S & 28S Modureg 90 ohms 

Biasi Parva M90 24S & 28S Gas Valve 920 ohms Upper Coil 

Biasi Prisma 24S, 24SE, 28S, 28SE Gas Valve 4.2 kPins 1-5 (Top & Bottom) 

Biasi Riva 24S & 28S Gas Valve 4.2 k Pins 1-5 (Top & Bottom) 

Biasi Riva Advance Gas Valve 6.4 k Top & Bottom Pins 

Biasi Riva Advance Gas Valve 920 ohms Bottom2 Pins 

Biasi Riva Advance Fan 24v DC 

Biasi Savio ACQUAPIU 120MFS, 124MFS Gas Valve 870 ohms Lower operator 

Biasi Savio ACQUAPIU 120RFS Modureg 125 ohms 

Biasi Savio ACQUAPIU 120RFS Gas Valve 900 ohms Lower operator Upper operator Biasi Savio Gaia 424RS & Riva 24SR Modureg 125 ohms

Biasi Savio Gaia 424RS & Riva 24SR Fan 47 ohms 

Biasi Savio GAIA 424S & 428S Gas Valve 4.2 kPins 1-5 (Top & Bottom) 

Biasi Savio gaia 424S & 428S & 120 MFSFan 47 ohms 

Biasi Savio Gaia 424RS Pump210 Myson CP53 

Biasi Savio Gaia 424RS Pump180 Myson CP63 (high lift) 

Biasi Savio Gaia 424RS Pump220 Salmson MYE30 

Biasi Savio Gaia 424RS Pump120 Salmson MYL50 (high lift) 

Boulter Buderus 500-24S -24C Gas Valve 240v AC V1 270ohms ~ V2 160ohms 

Boulter Buderus 500-24S -24C Fan 240v AC AC converts to DC at fan 

British Gas ICS1 ICC1 ICC2 -532i Pump 12 k ModulatingPump E74579 

British Gas ICS1 ICC1 ICC2 -532i Gas Valve 124 ohms - 204 ohms 

British Gas ICS1 ICC1 ICC2 -532i Fan 240v AC (From PCB- DC At Fan) 

British Gas RD1 Hot surface ignitor 160v AC 61 ohms 

British Gas RD1 APS 24v DC N/A 

British Gas RD2 APS 24v DC N/A 

Broag Avanta Plus Series Gas Valve 240v AC 1.9 k EV1 & EV2 

Chaffoteaux Britony Combi SE Gas Valve 115 ohms Solenoids A, B, and C 

Chaffoteaux Britony Combi SE Pump 177 ohms 

Chaffoteaux Britony Combi SE Fan 82 ohms 

Combi Gem Gas Valve 870 ohms Lower Operator 

Ferroli F 30 B & F 24 B Gas Valve 240v AC 2.6 k EV2 

Ferroli F 30 B & F 24 B Gas Valve 240v AC 2.9k ohms EV1 

Ferroli Domicompact F24 -F30B Gas Valve 240v AC 0.6 M Main Valve 

Ferroli Domicompact F24 -F30B Modureg 24v DC 81 ohms 

Ferroli Maxima 35c-35s Gas Valve 65v DC 1.6 k EV2 

Ferroli Maxima 35c-35s Gas Valve 130v DC 2.9 k EV1 

Ferroli Maxima 35c-35s Fan 24v DC 

Ferroli Modena 80e & 102 Gas Valve 1.3 k Top 2 Pins 

Ferroli Modena 80e & 102 Gas Valve 2.8 k Botton 2Pins 

Ferroli Modena 80e & 102 Fan 50 ohms 

Ferroli Optimax Gas Valve 1.6 k EV2 

Ferroli Optimax Gas Valve 2.9 k EV1 

Ferroli OptimaxFan 24v DC 

Ferroli SigmaFFrange Gas Valve 1.3 k Top 2Pins 

Ferroli SigmaFFrange Gas Valve 2.8 k Botton 2Pins 

GlowWorm 30CI Divertor Valve 240v AC (1-2) & 25v AC (2-3) Hot Water Demand (spindle retracts) GlowWorm 30CI Divertor Valve 240v AC (2-3) & 25v AC (1-2) Central Heating Demand (Spindle pushes out) GlowWorm 30CI Fan 240v AC 

GlowWorm 330+ Gas Valve 22vDC during ignition- 13vDC Normal operation (after rectification) 46 ohms GlowWorm 330+ Fan Red = 22vDC,Blue = 0vDC,Yellow = 7.8vDC,White = 2.2vDC At Rest (reading taken to Earth) 

GlowWorm 330+ Fan Red = 22vDC,Blue = 0vDC,Yellow = 11vDC,White = 6vDC Operating (reading taken to Earth) 

GlowWorm 330+ Ignition Unit 47vDC 

GlowWorm Economy F & Economy plus F Gas Valve 2.0 k - 2.8 k

GlowWorm Energysaver 80/100 & combi mk2 Ignition Wire Less than 1 k 

GlowWorm Flexicom CX DHW Flow sensor At rest - 0vDC Black, 4.6vDC Red, 0 or 5vDC Green. Calling - 0vDC Black, 4.6vDC Red, 2.4vDC Green (all measured to earth) 

GlowWorm Flexicom CX Diverter Valve Heating - Blue 2vDC, Green 2vDC, White 0vDC, Orange 0vDC 150 Harness may be Blue and Pink for heating. Reading taken to Earth 

GlowWorm Flexicom CX Diverter Valve Hot Water - Blue 0vDC, Green 0vDC, White 2vDC, Orange 2vDC 150 Harness may be Black and Brown for hot water. Readings taken to Earth 

GlowWorm Flexicom CX Fan Red= 22vDC, Blue= 0vDC, Black= 10.5vDC, Grey= 7.5vDC At Rest (reading taken to Earth) 

GlowWorm Flexicom CX Fan Red= 22vDC, Blue= 0vDC, Black= 5vDC, Grey= 13vDC - 9vDC Operating (reading taken to Earth) 

GlowWorm Flexicom CX Gas Valve 13 - 22vDC 45 

GlowWorm Flexicom CX Pump235 

GlowWorm Flexicom HX Fan Red= 22vDC, Blue= 0vDC, Black= 10.5vDC, Grey= 7.5vDC At Rest (reading taken to Earth) 

GlowWorm Flexicom HX Fan Red= 22vDC, Blue= 0vDC, Black= 5vDC, Grey= 13vDC - 9vDC Operating (reading taken to Earth) 

GlowWorm Flexicom HX Gas Valve 13 - 22vDC 45 

GlowWorm Fuelsaver F & UFB range Gas Valve 2.0 k - 2.8 k 

GlowWorm Ho****er Xpress 80 Modureg 120 to 140ohms 

GlowWorm HXI Gas Valve 24v DC 26.3 ohms Pins 3 & 4 

GlowWorm HXI Gas Valve 24v DC 26.4 ohms Pins 1& 2 

GlowWorm HXI Fan 44 (Iris PCBONLY) Brown & Blue at H3 

GlowWorm HXI Gas Valve 24v DC 52.7 ohms Pins 1& 4 

GlowWorm HXI Fan 14>17Vdc (Iris PCBONLY) At the Fuse 

GlowWorm HXI Ignition Module 59 Volts onSpark Red & Blue at H2 

GlowWorm I & XI range DC Fan Supply 14-17v DC (across fuse) 44 ohms Brown - Blue at H3 GlowWorm SI Gas Valve 24v DC for 1-2 secs then 12v DC 116 ohms 

GlowWorm Swiftflow 120Fan 2.5 ohms White - Grey 

GlowWorm Swiftflow 120Fan 2.5 ohms Grey - Purple 

GlowWorm Swiftflow 120Fan 2.5 ohms Purple - White 

GlowWorm Swiftflow 75 Modureg 120-140 ohms 

GlowWorm XI Range Ignition Module 59 Volt on spark - Red - Blue at H2 

GlowWorm XI Range Fan DC Voltage 27 k Green - Yellow at mainPCB 

GlowWorm XI Range Fan 38v DC Red - Blue at Fan 

GlowWorm XI Range Fan 26v DC Red - White at Fan 

GlowWorm Xtra fast Gas Valve 4 k Outer pins 

GlowWorm Xtra fast 96 & 120 System pressure sensor 280-320 ohms 0 Bar 

GlowWorm Xtra fast 96 & 120 System pressure sensor 93-143 ohms 3 Bar 

Grundfos PumpPump 150 ohms Speed 3 

Halstead Ace Fan 50 ohms 

Halstead Ace HE Divertor Valve 240Vac 12 k Red/yellow/black & blue wires into X4 Halstead Ace HE Fan 240Vav 12 m Brown to Blue Constant 240vSupply from X3 (even in standby) Halstead Ace HE Gas Valve 240Vac 3.6 k measured @ the two outside pins X2A Blue - Brown Wires Halstead Best 30 thru to 80 Fan 40 - 50ohms

Halstead Eden SBVB CBDC FanSupply 14-17v DC 44 ohms Brown - Blue at H3 

Halstead Eden SBVB CBFan DC Voltage 55 k Green - Yellow 

Halstead Eden SBVB CBFan 35v DC Red - Blue 

Halstead Eden SBVB CBFan 29v DC Red - White 

Halstead Eden SBVB CBIgnition Module 59 Volt on spark Red - Blue at H2 

Halstead Quatro, Quatro Gold, & LPG Gas Valve 4.26 kPins 1-5 (Top & Bottom) 

Halstead Quattro Fan 40 - 50ohms 

HeatlineS24 Gas Valve Pcb X17 230vAC Gas valve 230vdc pins 1+3 6k pins3+40.8k Gas valve lead dc covertor. Pin 1 top 4 bottom 

Herman Eura HE Gas Valve 240v AC 6.4 k EV2 

Herman Eura HE Gas Valve 240v AC 6.4 k EV2 

Herman Eura HE Gas Valve 240v AC 7.3 k EV1 

Herman Eura HE Gas Valve 240v AC 7.3 k EV1 

Herman Eura HE Fan 240v AC AC converts to DC at fan 

Herman Eura HE Fan 240v AC AC converts to DC at fan 

Herman Supermicra 24-30 HE Modureg 240v AC 22 ohms 

Herman Supermicra 24-30 HE Modureg 240v AC 22 ohms 

Herman Supermicra 24-30 HE Fan 240v AC 25.5 ohms @ 67 ? 

Herman Supermicra 24-30 HE Fan 240v AC 25.5 ohms @ 67 ? 

Herman Supermicra 24-30 HE Gas Valve 240v AC 6.4 k EV2 

Herman Supermicra 24-30 HE Gas Valve 240v AC 6.4 k EV2 

Herman Supermicra 24-30 HE Gas Valve 240v AC 7.3 k EV1 

Herman Supermicra 24-30 HE Gas Valve 240v AC 7.3 k EV1 

Honeywell 4043B 4044C Divertor Valve 1.9 k 

Honeywell Gas valve Gas Valve 24v AC 10 ohms 

Honeywell Gas valve Gas Valve 240v AC 1.12 k 

Ideal C80FF,C95FF + Wickes C80FF, C95FFGas Valve 1.6 kPins 4-5 

Ideal C80FF,C95FF + Wickes C80FF, C95FFGas Valve 2.8 kPins 1-2 

Ideal ClassicClassic HE9-HE12-HE15 HE19Fan 240v AC 30 ohms pins 15-18 

Ideal ClassicClassic HE9-HE12-HE15 HE19Fan 240v AC 56 ohms pins 9-12 

Ideal ClassicClassic HE9-HE12-HE15 HE20 Gas Valve 240v AC 1.5 kPilot Solonoid Ideal ClassicClassic HE9-HE12-HE15 HE20 Gas Valve 240v AC 5.15 k Main Solonoid Ideal ClassicFF250 etc Gas Valve 1.5 k Pilotsolenoid 

Ideal ClassicFF250 etc Gas Valve 5 k 

Ideal Isar - CP Water set (Red top) Diverter Valve Head - H28069 Cart - H28070 Black - 240v AC, Blue - N, Brown - 240v AC in Hot Water and 0-130vAC in Heating 

Ideal Isar - Elbe (All black) Diverter Valve Head - H58165 Cart - H66586 Red - N, Gray - 240v AC on Heating, Violet - 240v AC on Hot Water 

Ideal Isar - VJ Waterset (Honeywell) Diverter Valve Head - H09846 Cart - 799078 Water - 240v AC Red - Violet (Lever Fwd), Heating - 240v AC Red - Grey, Yellow - 240v AC all time 

Ideal Isar & Icos system Pump 220 ohms 

Ideal Isar & Icos system Diverter Valve 7.7 k 

Ideal Isar, Icos & Icos system Gas Valve 4.2 k 

Ideal Isar, Icos, Icos system Fan 110-130 ohms Pins 1-5 

Ideal Logic code combi 26,33,38 Gas Valve 215vdc X2A pin 1&2 may operate as low as 150vdc 4.2 k gas

valve pins 1 & 5 Non adjustable. 

Ideal Logic code combi 26,33,38 Fan 240vAC PlugX3 pin 1&2 Constant 230vac to fan with mains to appliance Ideal Logic code combi 26,33,38 Low water pressure switch X8 Orange to earth 0 bar = 0.4vdc 1bar = 1.3vdc 1.5bar = 1.5vdc 

Ideal Response 80, 100, 120 Gas Valve 4.09 k EV2 

Ideal Response 80, 100, 120 Gas Valve 837 ohms EV1 

Johnson & Starley Reno HE 16S Gas Valve 240v AC 2.3 k EV1 

Johnson & Starley Reno HE 16S Fan 240v AC 

Johnson & Starley Reno 16H Gas Valve 240v AC 2.3 k EV1 

Johnson & Starley Reno 16H Fan 240v AC 

Johnson & Starley Reno HE 31H Gas Valve 240v AC 2.3 k EV1 

Johnson & Starley Reno HE 31H Fan 240v AC 

Johnson & Starley Reno HE 31S Gas Valve 240v AC 2.3 k EV1 

Johnson & Starley Reno HE 31S Fan 240v AC 

Johnson & Starley Reno HE 37C Gas Valve 240v AC 2.3 k EV1 

Johnson & Starley Reno HE 37C Fan 240v AC 

Keston 30C Fan 240vAC Plug X3 pin 1&2 Constant 230vac to fan with mains to appliance Keston 30C Gas Valve 215vdc X2A pin 1&2(may operate as low as 150vdc,volt comes through flue stat) Approx 4.1k gas valve pins 1&5 Non adjustable. 

Keston 30C Pump 240vAC Plug X1C pins 1&2 

Keston 30C Low water pressure switch X8 Orange to earth 0 bar = 0.4vdc 0.5 bar = 1.1vdc 1bar = 1.3vdc 1.5bar = 1.5vdc 

Keston 30C Dhw flow switch X8 Term 9 to earth No demand 5vdc Demand 2.5vdc 

Keston C36 Combi Fan 240v AC to 3 pin conector Approx 3.9M Voltage on 3 pin connector at all times. Keston C36 Combi Gas Valve GV1 - 1.6k GV2 2.8k 

Keston C36 Combi Water Pressure Sensor Approx 1.8vDC Red-Blue @ 2bar Approx 4.5k Red- Blue @ 2bar Keston Celsious 25Fan 24v DC Between Two Outer Pins (at Fan) 

Myson CP53Pump 210 ohms Speed 3 

Myson CP63Pump 180 ohms Speed 3 

Myson Midas Si & Sfi Air Flow Sensor 7-30 ohms between red & black wires + red & green wires Potterton Kingfisher MF range of boilers FanSensor 127-132 k White/Grey wires 

Potterton Kingfisher MF range of boilers Gas Valve 13-15 k GV2 

Potterton Kingfisher MF range of boilers Gas Valve 7-8 k GV1 

Potterton Lynx 2 Transformer 2 ohms Yellow - Black 

Potterton Lynx 2 Transformer 4 ohms Orange - Orange 

Potterton Lynx 2 Transformer 240v AC 70 ohms L-N 

Potterton Lynx RS AirFlow Sensor 1.5 - 1.8ohms 

Potterton Lynx RS Modureg Approx 50ohms 

Potterton Netaheat Profile 50e to 80e Gas Valve 3 M Pilotsolenoid 

Potterton Netaheat Profile 50e to 80e Gas Valve 5 k 

PottertonPerforma 24, 28, 28i Modureg 40 ohms 

PottertonPromax FSB30 HE Gas Valve 4.1 k Outside 2Pins 

PottertonPromax FSB30 HE Fan 325v DC 

PottertonPromax FSB30 HE Fan Protection stat 110 degrees 

PottertonPromax range of boilers Gas Valve 1.3 k EV1

PottertonPromax range of boilers Gas Valve 2.9k ohms EV2 

PottertonPromax range of boilers Fan 12v DC to 20v DC 

PottertonSuprima range of boilers Gas Valve 1.3 k Black - White 

PottertonSuprima range of boilers Gas Valve 2.9 k Red - White 

PottertonSuprima range of boilers Gas Valve 4.1 k Black - Red 

Ravenheat CSI 120 Gas Valve 1.8 k EV1 & EV2 

Ravenheat CSI 120Fan 24v DC 

Ravenheat CSI 85 Range Modureg 121 ohms 

Ravenheat LS 100 Range Gas Valve 1.3 k Early models (EV2) 

Ravenheat LS 100 Range Gas Valve 1.9 k Later models (EV1) 

Ravenheat LS 100 Range Gas Valve 1.9 k Later models (EV2) 

Ravenheat LS 100 Range Modureg 136 ohms All Models 

Ravenheat LS 100 Range Gas Valve 2.91 k Early models (EV1) 

Ravenheat RSF100ET Gas Valve 3.5 k - 4.5 k Centre pin earth. Pineither side are coil neutrals and outer pins coil live 

Ravenheat RSF82 ET Modureg 120 ohms 

Ravenheat RSF82 ET Gas Valve 3.9k EV2 

Ravenheat RSF82 ET Gas Valve 4.3 k EV1 

Ravenheat RSF84ET/84E, 100ET/100E Fan 55 ohms 

Salmson MYE30 Pump220 ohms Speed 3 

Salmson MYL50 Pump120 ohms Speed 3 

Saunier Duval Combitek F23E Modureg (Low) 0-21v DC (High) 81 ohms 

Saunier Duval Combitek F23E Gas Valve 24v AC 85 ohms EV1 /EV2 

Saunier Duval Enviroplus F28E DC Fan Supply14-17v DC 44 ohms Brown - Blue at H3 Saunier Duval Enviroplus F28E Fan DC Voltage 55 k Green - Yellow 

Saunier Duval Enviroplus F28E Fan 35v DC Red - Blue 

Saunier Duval Enviroplus F28E Fan 29v DC Red - White 

Saunier Duval Enviroplus F28E Ignition Module 59 Volt on spark Red - Blue at H2 Saunier Duval Isofast F28E & F35E System pressure sensor 195-220 ohms 1Bar 

Saunier Duval Isofast F28E & F35E System pressure sensor 280-320 ohms 0 Bar 

Saunier Duval Isofast F28E & F35E System pressure sensor 93-143 ohms 3 Bar 

Saunier Duval SD 623 Pump resistor 270 ohms 

Saunier Duval SD30e Fan Less than 50 k 

Saunier Duval SD623 & Thelia 623Fan resistor 1200 ohms 

Sime Eco comfort HE + Fan 240v AC sent to fan on 1 plug, DC speed control etc on other fan plug Sime Eco comfort HE + Gas Valve 240v AC 

SimeFormat Combi 30HE Gas Valve 240v DC 1.4 k EV2 

SimeFormat Combi 30HE Gas Valve 240v DC 2.9 k EV1 

SimeFormat Combi 30HE Gas Valve 240v DC 4.2 k Outside 2 Pins 

SimeFormat Combi 30HE Fan 240v AC Back Connection 

SimeFormat System 25HE Gas Valve 240v DC 1.4 k EV2 

SimeFormat System 25HE Gas Valve 240v DC 2.9 k EV1 

SimeFormat System 25HE Gas Valve 240v DC 4.2 k Outside 2Pins 

SimeFormat System 25HE Fan 240v AC Back Connection 

Sime Murelle HE Fan 240v AC sent to fan on 1 plug, DC speed control etc on other fan plug

Sime Murelle HE Gas Valve 240v AC 

SimePlanet Dewy/Super 4 WM Transducer 297-320 ohms 0 Bar 

SimePlanet Dewy/Super 4 WM Transducer 90-94 ohms 3.5 Bar 

Vaillant Ecomax with brass 3 port diverters Diverter Valve 190 ohms 

Vaillant Ecotec PROPump 240v AC 230ohm 

Vaillant Ecotec range Fan 24vDC 33Mohm Check voltage Red wire to earth. Check resistance Red to Blue. Vaillant Ecotec range Diverter Valve 15-22v DC 130ohm CH - Pink to earth 22vDC while moving, HW - Brown to earth 15vDC while moving. 

Vaillant Ecotec range Gas Valve 12-22v DC 51ohm Check Red to Blue 

Vaillant Turbomax 242E Gas Valve 2 k GV1 

Vaillant Turbomax 242E Gas Valve 200 ohms GV2 

Vaillant Turbomax 242E Modureg 75 ohms 

Vaillant VCW range (242EH etc) Transformer 24 v 1 ohms 

Vaillant VCW range (242EH etc) Transformer 240v AC 110 ohms 

Vaillant VCW range (242EH etc) Pump 180 ohms 

Vaillant VCW range (242EH etc) Ignition Module 2 - 3 m 

Vaillant VCW range (242EH etc) Diaphragm pump 20 ohms 

Vaillant VCW range (242EH etc) Gas Valve 220 ohms 

Vaillant VCW range (242EH etc) Fan 40 ohms 

Viessmann Vitodends 100 WB1A Gas Valve 240 AC converted to DC at gas valve plug 1.6 k EV2 Viessmann Vitodends 100 WB1A Gas Valve 240 AC converted to DC at gas valve plug 2.8 k EV1 Viessmann Vitodends 100 WB1A Fan Variable DC 

Viessmann Vitodends 200 WB2A Gas Valve 240 AC converted to DC at gas valve plug 1.6 k EV2 Viessmann Vitodends 200 WB2A Gas Valve 240 AC converted to DC at gas valve plug 2.8 k EV1 Viessmann Vitodends 200 WB2A Fan Variable DC 

Vokera Compact HE 25/29 Diverter Valve 240v AC Brown = Heating,Black = Hot Water, Blue = N Vokera Compact HE 25/29 Pump240v AC 15/50 Low Energy 

Vokera Compact HE 25/29 Gas Valve 240v AC 

Vokera Compact HE 25/29 Fan 240v AC PCBCN3 - 1&2 

Vokera Compact HE 25/29 Ignition Module 240v AC PCB CN1 - 2&3 

Vokera 18/72 DMCF, RSTurbo, DC Turbo Modureg 50 ohms 

Vokera 20-80 RS Flowmatic Gas Valve 240v AC 5 k Main Valve 

Vokera 20-80 RS Flowmatic Modureg Max Gas 0v DC -12.5v DC Min Gas 50 ohms Vokera 20-80 RS FlowmaticFan 240v High speed /110-140v Low speed 55 ohms 2 speed (one winding) Vokera 20-80 RS FlowmaticFan resister 240v in 110-140V out 560 ohms 

Vokera 21/84 MCF Modureg 50 ohms 

Vokera 24-96 CF Flowmatic Modureg 50 ohms 

Vokera Excell 80SP Modureg 560 ohms 

Vokera Linea 24 Fan 54-55 ohms 

Vokera Linea 24 Modureg 70-80 ohms 

Vokera Linea 24 Gas Valve 800-900 ohms Main Valve 

Vokera Linea 25-30-35 HE Gas Valve 240v AC 6.5 k EV1 

Vokera Linea 25-30-35 HE Gas Valve 240v AC 7.4 k EV2 

Vokera Linea 25-30-35 HE Fan Variable DC 

Vokera Linea 726 Gas Valve 770 ohms MainSolonoid

Vokera Linea 726 Modureg 82 ohms 

Vokera Maxin 24E & 28E Gas Valve Top 2 Pins=1.32 k ~Bottom 2Pins= 2.7 k Centre Pinis Earth (either side are neutrals) 

Vokera Excell Fan resistor 5.6 k 

Vokera Excell Fan 55 ohms 

Vokera ProCombi A Fan 240v AC Blue - Brown CN1 3-4 

Vokera ProCombi A Pump 240v AC Blue - Brown CN5 1-2 

Vokera ProCombi A Gas Valve 240v AC Blue - Brown CN3 1-2 

Vokera ProCombi A Diverter Valve 240v AC Blue - Black HW, Blue - Brown CH 

Vokera ProCombi A Ignition Module 240v AC Blue - Brown CN2 2-3 

Wickes 2000 Gas Valve 4.2 k Pins 1-5 (Top & Bottom) 

Wickes Wickes 2000 Gas Valve 4.2 kPins 1-5 (Top & Bottom) 

Worcester / Bosch 350 Transformer 240v AC >180 ohms x2 BR-BL 

Worcester / Bosch 350 Fan resistor 350 ohms 

Worcester / Bosch 350 Gas Valve 510 ohms GV 2 

Worcester / Bosch 350 Gas Valve 565 ohms GV 1 

Worcester / Bosch 15-18 RI System Gas Valve 33v DC (Nominal 24-38v DC) 160 ohms BothSolonoids Worcester / Bosch 15-18 RI System Fan 240v AC AC converts to DC at fan 

Worcester / Bosch 24 CDI Gas Valve 20v DC Main Solonoid 

Worcester / Bosch 24 CDI Modureg 6v DC (low) -14v DC (High) 

Worcester / Bosch 24/28si Fan (Low Speed) 240v AC 75-175ohms Black- White 

Worcester / Bosch 24/28si Fan (High Speed) 240v AC 20-60 ohms Black- Red 

Worcester / Bosch 280 RSFModureg 120 ohms 

Worcester / Bosch 9.24 BF/OF, 240, 280 Modureg 120 ohms 

Worcester / Bosch C1 Transformer Less than 100ohms 

Worcester / Bosch CDI Gas Valve less than 100ohms (usually around 60-70) Main Solonoid Worcester / Bosch CDI Modureg Less than 60 k 

Worcester / Bosch Greenstar Cdi Fan 230v AC constant purple to brown 

Worcester / Bosch Greenstar Cdi Gas Valve 25-34v DC 

Worcester / Bosch Greenstar Junior 24i/28i Gas Valve 160 ohms +/-10% 

Worcester / Bosch Greenstar Junior 24i/28i Diverter Valve 170 (+/-20%)Pins 1-2 ~ 2-3 ~ 4-5 ~ 5-6 Worcester / Bosch ICC2 ZWBR 11-37 Gas Valve 55 ohms 

Worcester / Bosch ZWBR 7-25A23 & ZWBR 11-25A31 Transformer 0.2ohms Pins 12-13 Worcester / Bosch ZWBR 7-25A23 & ZWBR 11-25A31 Transformer 1.4 ohms Pins 10-11 Worcester / Bosch ZWBR 7-25A23 & ZWBR 11-25A31 Gas Valve 160 ohms White Terminal block 9-10 (black Wires) 

Worcester / Bosch ZWBR 7-25A23 & ZWBR 11-25A31 Gas Valve 160 ohms White Terminal block 7-8 (black Wires) 

Worcester / Bosch ZWBR 7-25A23 & ZWBR 11-25A31Pump 180 ohms Position two Worcester / Bosch ZWBR 7-25A23 & ZWBR 11-25A31 Diverter Valve 185 ohms White Terminal block 3-4 (Violet Wires) 

Worcester / Bosch ZWBR 7-25A23 & ZWBR 11-25A31Pump 250 ohms Position One Worcester / Bosch ZWBR 7-25A23 & ZWBR 11-25A31 Transformer 41 ohms Pins 5-7