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FAULT FINDING
Check central heating and controls
Ensure that radiator temperature control knob
is set to vertical position and that any internal
timer (if fitted) is calling for heat
No
Is 230 VAC present across terminals 4 and 5
No
External fault: Check all external controls are
calling for heat, replace or repair as necessary
(see also note 1 sheet A)
Yes
Yes Disconnect built in timer (if fitted)
No Go to sheet D
Does ignition
commence?
No
Yes
Replace defective
timer
Sheet C
Does yellow central heating demand
indicator glow? Does yellow flame indicator flash?
60


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