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- Installation & Servicing

FAULT FINDING

FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING

Code Description Action

b 18 Flow temperature >95degC Check no air in system or boiler

Check adequate flow of water through boiler

b 19 Return temperature >95degC Check no air in system or boiler

Check adequate flow of water through boiler

b 24 Return temperature > Flow temperature for excessive time Check no air in system or boiler

Check adequate flow of water through boiler

b 25 Flow temperature rise too fast Check no air in system or boiler

Check adequate flow of water through boiler

b 26 Minimum water pressure switch not closed Check no air in system or boiler

If sealed system check charge pressure

If open vent system check minimum head is 3m

Check wiring to water pressure switch

Check water pressure switch with meter & replace if necessary

b 30 Flow/return temperature differential too high Check no air in system or boiler

Check adequate flow of water through boiler

b 33 Tank sensor short circuit Check wiring

Disconnect terminals from tank sensor & confirm

short circuit using meter

Replace tank sensor

b 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

b 61 Air pressure switch closed (W80 only) Check for blockages in air pressure switch

sensing pipes

Check air pressure switch & replace if necessary

b 65 Waiting for fan tacho signal at start up Check fan wiring

If no tacho signal from fan, replace fan

Boiler Control Module Blocking Codes

IDEAL imax W80P User Manual

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