Domestic Gas Boiler

Worcester Bosch CDi Classic Regular Boiler Error Codes

Worcester Bosch CDi Classic Regular Boiler Error Codes Fault Description System Behaviour B1 Code plug not detected C6 Fan speed too low E2 Central heating (CH) flow negative thermistor coefficient (NTC) sensor defective E9 Safety temperature limiter in central heating (CH) flow has tripped EA Flame not detected F0 Internal error F7 Flame detected even …

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Worcester Bosch  Greenstar 25/30 Si Combi Boiler Error Codes

Worcester Bosch  Greenstar 25/30 Si Combi Boiler Error Codes Fault Description System Behaviour T1 Ignition test – checking the igniter spark T2 Fan test – checking the basic fan T3 Pump test – checking the basic pump T4 Three way valve test T6 Ionisation oscillator test 9A 362 error – incorrect HCM fitted 9U 233 …

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Worcester Bosch CDI Highflow Combi Boiler Error Codes

Worcester Bosch CDI Highflow Combi Boiler Error Codes Fault Description System Behaviour A1 Pump dry run detection or pump is running in air the system pressure needs checking A5 Tank negative thermistor coefficient (NTC) defect A7 Domestic hot water (DHW) negative thermistor coefficient (NTC) defect A8 Energy Management System (EMS) communication error B1 Code plug …

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Vaillant EcoTEC Gas Boiler Diagnostic codes

Vaillant EcoTEC Gas Boiler Error Codes Fault Code Possible Cause D.0 Heating part load error D.1 Water pump overrun – time for heat mode D.2 Max burner anti-cycling period at 20c flow temperature D.3 Hot water flow temperature reading D.4 Current temperature for warm stat sensor D.5 Set value of flow temperature or target value …

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Vaillant EcoTEC Plus Regular Gas Boiler Error Codes (Status Codes)

Vaillant EcoTEC Plus Regular Gas Boiler Error Codes Fault Code Possible Cause S.20 Warnstar demand S.21 Fan running S.22 Pump running S.23 Ignition sequence S.24 Burner ignited S.25 Fan and water pump running S.26 Fan overrun S.27 Pump overrun S.28 Anti-cycling mode S.30 No heating demand from external controls S.31 Central heating thermostat knob turned …

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Vaillant EcoTEC Pro / EcoTEC Plus Error Codes ( Fault Codes )

Vaillant EcoTEC Pro / EcoTEC Plus Error Codes Listed below are the most common error codes that you might see on your Vaillant EcoTEC Pro boiler. Fault Code Possible Cause F.00 / F.0 Flow temperature sensor interruption F.01 / F.1 Return temperature sensor interruption F.10 Flow NTC short circuit F.11 Return NTC short circuit F.20 …

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Vaillant Boiler Error Codes (Status Codes)

Vaillant EcoTEC Pro / EcoTEC Plus Error Codes Listed below are the most common error codes that you might see on your Vaillant EcoTEC Plus boiler. Fault Code Possible Cause S.00 Heating mode error – no heat demand S.01 Heating mode fan start-up S.02 Heating mode error – water pump running S.03 Heating mode – …

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What is a Boiler Service?

What is a Boiler Service? A boiler service will include of a full check of a gas boiler.  The engineer will assess the physical condition of the boiler, installation pipework, air vents and any flues for wear and tear. They will carry out performance tests and take any necessary remedial action. Gas Safe highly recommends boilers should …

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Vaillant Ecomax Pro 828E (Fault Codes)

Vaillant Ecomax Pro 828E Fault Code Possible Cause F.00, .04, .05, .10, .14, .15 All of these are NTC faults, and are best resolved by first changing all NTC to make diagnosis earlier. F.21 The pilot flame has failed. F.22 There is insufficient water in your system. F.11 A blockage in the appliance is preventing …

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Vaillant EcoMax Pro 18/28E (Fault Codes)

Vaillant EcoMax Pro 18/28E Fault Code Possible Cause F.1 Lack of gas, a fault with the ignition or flue – may need to adjust the gas valve or replace a defective electrode lead. F.4 Ignition fault. F.5 The system has suffered a fault due to overheating. F.6 Your flow NTC has developed a fault. F.17 …

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