42
4000123923-2
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 PCB, replace.
11876
• CHECK CONTIUITY OF SPARK (ELECTRODES AND LEADS)
• CHECK POWER SUPPLY FROM PCB TO IGNITION UNIT
Air flow switch take-off.
CONNECTIONS TO THE AIR PRESSURE SWITCH
Pr
3
21
P2
P1
LH
Electrical contacts.
FAULT: THE FAN RUNS BUT THERE ARE NO SPARKS.
11877
18 Fault Finding
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 shoul
stay cold in Summer setting)
Is the temperature higher if you reduce
the flow through the taps?
11875
30ci Only
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