Glow-worm COMPACT 80p Instructions For Use, Installation & Servicing page 31

NB. The clock can be by passed by refitting the plug link which should be inside the clock timer cover.
Check continuity of clock/timer harness, ensure an electrical supply is available,
ensure that remote controls are calling for heat.
Isolate the boiler from electrical supply remove outer case.
YES
Switch on electrical supply,
is there a display on clock/timer?
YES
Disconnect and insulate the cables
from heating common and heating on.
YES
Advance clock/timer until a demand is indicated
Is there now continuity between heating
common and heating on?
YES
Clock/timer in order if no central heating,
refer to main fault finding.
DIGITAL FAULT FINDING
NB. The clock can be by passed by refitting the plug link which should be inside the clock timer cover.
Check continuity of clock/timer harness, ensure an electrical supply is available at the clock,
ensure that remote controls are calling for heat, ensure the override switch, if fitted, is in overide position.
Does clock keep time?
YES
Isolate electrical supply, set clock to an on period.
Is there continuity across common and heating?
YES
Set clock to off period. Is there continuity across
common and heating on?
NO
Clock/timer in order if no central heating,
refer to main fault finding.
ELECTRO/MECHANICAL FAULT FINDING
Supplied By www.heating spares.co Tel. 0161 620 6677
13 Fault Finding
(N) (L)
PLUG FROM CLOCK/TIMER
31
NO
Faulty clock/timer.
Replace.
NO
Faulty clock/timer.
Replace.
NO
Faulty clock/timer.
Replace.
NO
Faulty clock/timer.
Replace.
YES
Faulty clock/timer.
Replace.
EXTERNAL
CONTROLS
Diagram 13.6
Diagram 13.7
221679H