BYPASS INTERNAL CLOCK

Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

CH Demand

Gain access to internal clock wiring
Remove the wires from L1 (grey) and L1' (black) and make safe
Place a wire link between L1 and L1' on the internal clock

WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure

Mains Power On

Observation:

Does the boiler now respond to a CH demand ?
(Box appears around the radiator symbol on the display)

ar clas one 24.pcb exposed.timer fitted.gif

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Link wire placed between L1 and L1' terminals.

Note.
Photo shows timer removed for clarity but the test should be carried out with the timer insitu.