49
- Installation & Servicing
FAULT FINDING
FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING
Code Description Action
E 17 Internal failure Check wiring harnesses & connections
If wiring OK replace boiler control module
E 18 Flow temperature too high Check no air in system or boiler
Check adequate flow of water through boiler
E 19 Return temperature too high Check no air in system or boiler
Check adequate flow of water through boiler
E 25 Flow temperature rise too fast Check no air in system or boiler
Check adequate flow of water through boiler
E 28 No tacho from fan Check electrical connections to fan
If connections OK & fan rotates, replace fan
E 29 Tacho signal from fan does not reset to zero Replace fan
E 30 Flow/return temperature differential too high Check no air in system or boiler
Check adequate flow of water through boiler
E 31 Flow thermister short circuit Check wiring
Disconnect terminals from thermistor & confirm
short circuit using meter
Replace thermister
E 32 Return thermistor short circuit Check wiring
Disconnect terminals from thermister & confirm
short circuit using meter
Replace thermister
E 33 DHW thermistor short circuit Check wiring
Disconnect terminals from thermister & confirm
short circuit using meter
Replace thermister
E 36 Flow thermistor open circuit Check wiring
Disconnect terminals from thermister & confirm
open circuit using meter
Replace thermister
E 37 Return thermistor open circuit Check wiring
Disconnect terminals from thermister & confirm
open circuit using meter
Replace thermister
E 38 Tank sensor open circuit If not fitted check parameter 35 settings
Check wiring
Disconnect terminals from tank sensor & confirm
open circuit using meter
Replace tank sensor
E 44 Internal failure Check wiring harnesses & connections
If wiring OK replace boiler control module
E 60 Error reading parameters Replace boiler control module
E 61 Air pressure switch does not open (W80 only) Check for blockages in air pressure switch
sensing pipes
Check air pressure switch & replace if necessary
E 65 Not enough fan driving force Check supply voltage to fan
Replace fan
Boiler Control Module Error Codes Continued
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