89
NO HW BUT CH OK
90
BLANK DISPLAY
Are the Timer and Cylinder Stat calling for heat?
Are the Radiator Valves open?
Does the Zone Valve move to the appropriate
position?
Is an Ideal Electronic Programmable Room Stat
connected?
Is there 230Vac at (A) or (B)?
Replace main PCB
No
No
Yes
Yes
Yes
Yes
Yes
Is there 230Vac to the boiler at (A)?
Is the wiring from the boiler terminal block to the main
PCB connected securely?
Does the wiring from the boiler terminal block to the
Main PCB have continuity?
Is the cable from the main PCB to the user interface
PCB connected securely?
Does the cable from the main PCB to the user
interface PCB have continuity and is un-damaged?
Is the Fuse on the main PCB OK?
Replace the user interface PCB, still no display?
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
Supply power to the boiler
Connect the wiring from the terminal
block to the main PCB securely
Replace the wiring from the boiler
terminal block to the Main PCB
Connect the cable from the main PCB to
the user interface PCB securely
Look for shorts on pump/diverter valve/
fan/spark generator/gas valve and replace
Replace Main PCB
Replace main PCB
Ensure the Timer and Cylinder stat are calling for heat
Open the Radiator Valves
Check zone Valve and Zone Valve Wiring
Consult Electronic Programmable Room Stat Fault Finding Instructions
There is no voltage from the Timer/Cylinder Stat. This is not a boiler fault.
ensure voltage is supplied to the boiler by correcting external wiring.
No
No
No
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