42
4000123944-2
18 Fault Finding
FAULT: THE FAN DOES NOT START.
Check continuity of fan harness.
NO
YES
Is there 230V ac
at fan during demand?
Faulty fan, replace.
YES
Faulty C, replace.
FAULT: THE WATER AT THE TAPS IS LUKE-WARM.
NO
YES
Check that the flow restrictor on the cold
water inlet is fitted.
Check the rate of flow.
Check burner pressure is correct.
Check the 3-way valve is not passing
into the radiators. (The radiators should
stay cold in Summer setting)
Is the temperature higher if you reduce
the flow through the taps?
9966p9968p
• CHECK CONTINUITY OF IGNITION (ELECTRODES AND LEADS)
• CHECK POWER SUPPLY FROM PCB TO IGNITION UNIT
Air flow switch take-off.
CONNECTIONS TO THE AIR PRESSURE SWITCH
Pr
3
2 1
P2
P1
LH
Electrical contacts.
FAULT: THE FAN RUNS BUT THERE ARE NO SPARKS.
11877
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