IDEAL imax W45 Installation And Servicing Manual page 50

Boiler Control Module Blocking Codes
Code Description
b 18 Flow temperature >95degC
b 19 Return temperature >95degC
b 24 Return temperature > Flow temperature for excessive time
b 25 Flow temperature rise too fast
b 26 Minimum water pressure switch not closed
b 30 Flow/return temperature differential too high
b 33 Tank sensor short circuit
b 38 Tank sensor open circuit
b 61 Air pressure switch closed (W80 only)
b 65 Waiting for fan tacho signal at start up
50
FAULT FINDING
Action
Check no air in system or boiler
Check adequate flow of water through boiler
Check no air in system or boiler
Check adequate flow of water through boiler
Check no air in system or boiler
Check adequate flow of water through boiler
Check no air in system or boiler
Check adequate flow of water through boiler
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
Check no air in system or boiler
Check adequate flow of water through boiler
Check wiring
Disconnect terminals from tank sensor & confirm
short circuit using meter
Replace tank sensor
If not fitted check parameter 35 settings
Check wiring
Disconnect terminals from tank sensor & confirm
open circuit using meter
Replace tank sensor
Check for blockages in air pressure switch
sensing pipes
Check air pressure switch & replace if necessary
Check fan wiring
If no tacho signal from fan, replace fan
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Installation & Servicing