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Boiler Fault Finder

Blocked plate exchanger

Waterways restricted with debris accumulation (rust/magnetite) Scale formation (hard water areas depositing calcium carbonates) Filter blocked (sometimes located on the primary inlet to protect the plate exchanger from waterborne debris accumulation) Electrically isolate boiler / syst
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Boiler Fault Error Codes

Boiler Faults and Error Codes

Boiler Fault Error codes listed with fault codes and how to solve. Heating Engineers.
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Boiler Shuts Down

Boiler shuts down and goes to lockout Fault Fix faulty pump (not at full capacity) replace pump head faulty fan (not at full capacity) check / lubricate bearings clear debris build up replace fan assembly blocked condensate pipe work/trap clear blockage / ice plug or Increase pipe wor
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Burner Not Igniting

Fault Fix faulty thermocouple check connections / replace thermocouple faulty gas valve (sticking armature) replace solenoid / gas valve faulty ignition electrodes / leads inspect gap(s) / condition faulty printed circuit board replace circuit board blocked injector check injector gas
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Domestic Hot Water Faults

When the hot water is ok but the central heating is not, this eliminates all operating sequence possible faults such as the fan, air pressure switch, pump, ignition sequence, ignition detection, gas valve and domestic hot water thermistor. Therefore, the fault can only be at the: Dive
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Explosive Ignition

Fault Fix pilot assembly not positioned correctly reposition assembly faulty gas valve (over gassing) check burner pressures faulty gas valve (sticking armature) replace solenoid / gas valve partially blocked burner clean / service burner faulty ignition electrodes inspect gap(s)/cond
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Fan Problems

Fan running but no ignition at electrodes Fault Fix air pressure switch hoses loose check ports and firmly fix split / kinked hoses remove kink / replace hose water in hoses (condensation) dry hoses / replace hoses reversed pressure connections (hoses wrong way around) correctly conne
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Faulty printed circuit board (hot water side)

Where printed circuit boards do not exhibit any obvious burnt spots (dark staining), cracked joints, blown fuses or any other signs such as water damage, one should never presume it is in full working order. Diminutive components such as resistors, potentiometers, capacitors, transist
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General Boiler Fault Finding for Heating Engineers

General Fault finding

The professional heating engineer’s complete “Boiler Fault Finder” for boiler and central heating fault finding. “Boiler Fault Finder” results from years of experience as a professional service and repair engineer, demonstrating technical expertise within the i
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Noisy Fan

Fault Fix Worn bearings replace fan Jammed air rotor lubricate rotor Impeller heavy with foreign matter accumulation clean / service fan… This content is for Annual Subscription and Annual Subscription Special members only. Please login to view this content. (or Register here.)N
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Noisy Heat Exchanger

Noisy heat exchanger (‘kettling’ and/or banging) Fault Fix Magnetite / rust blockages in waterways Chemical cleanse system Pump head failing (not at full capacity) replace pump head Boiler control thermostat faulty (causing overheat stat to trip) replace thermostat… This content
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Noisy Hot Water Flow Switches

Fault Fix faulty mechanism (loose internal paddle or wheel) replace switch… This content is for Annual Subscription and Annual Subscription Special members only. Please login to view this content. (or Register here.)Noisy Hot Water Flow Switches was last modified: March 7th, 201
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Noisy Pump

Fault Fix Trapped air vent system and pump Impellor out of alignment replace pump head… This content is for Annual Subscription and Annual Subscription Special members only. Please login to view this content. (or Register here.)Noisy Pump was last modified: March 7th, 2014 by Bo
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Noisy Solenoid

Fault Fix loose mounting check mounting return spring loose replace solenoid faulty solenoid replace solenoid… This content is for Annual Subscription and Annual Subscription Special members only. Please login to view this content. (or Register here.)Noisy Solenoid was last modi
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Pressure Relief Valve Problems

Pressure relief valve opening / pressure gauge continuously climbing Fault Fix undersized expansion vessel upgrade vessel size valve faulty or seat contaminated with sludge replace valve plate to plate heat exchanger faulty (fractured) replace plate exchanger filling loop faulty / pas
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Radiator Problems

Radiators warm up when hot tap opens / central heating flow pipe very hot with radiators hardly getting temperature rise Fault Fix faulty diverter valve (faulty wax capsule or bobbin assembly) replace valve Radiators warm up when no hot tap is open and the timer is in the off position
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