78
NO CH OPERATION
Is the mode knob in the ON position?
YES
YES
YES
NO
Move the mode knob to the ON position
Are the Timer and the Room Thermostat switched on?
Are the Radiator Valves Open?
Is there 230Vac at (A)?
NO
NO
Switch the Timer and Room Thermostat On
Open the Radiator Valves
There is no Voltage from the Timer/Room
Stat. This is not boiler fault. Ensure
Voltage is supplied to boiler by rectifying
external wiring.
YES NO
A
A
Check wiring from
terminal strip to PCB.
79
NO DHW
Is the mode knob in the ON position?
YES
NO
Move the mode knob to the ON position
Are the Timer and the Cylinder Thermostat switched on?
YES
NO
Switch the Timer and Cylinder Thermostat On
Is there 230Vac at (A)?
YES NO
There is no Voltage from the Timer/Cylinder
Stat. This is not boiler fault. Ensure Voltage is
supplied to boiler by rectifying external wiring.
Check wiring from
terminal strip to PCB.
80
NO DISPLAY
Is there 230Vac to the boiler at L and N?
YES
NO
Supply power to the boiler
Is the wiring from the terminal block to the Main PCB
connected securely?
YES
NO
Connect the wiring from the terminal block to the
Main PCB securely.
Is the ribbon cable from the main PCB to the User
Interface PCB connected securely?
Connect ribbon from main PCB
to User Interface PCB securely
YES
NO
Replace User
Interface PCB
Is ribbon cable
damaged?
YES NO
Replace ribbon
cable
N
L
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