Fault Finding Solutions Sections
12.0 Fault Finding
AIs there 230V at:
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Main terminals L and N | Check electrical supply |
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NO |
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Main terminal fuse |
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| Replace fuse |
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3. |
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PCB - X1 connector |
| Check wiring |
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BCheck all system wiring and pump
CService Reset
Condensate Pump does not run 
On Reset is there 230V at:
NO
Replace PCB
1. | PCB - X3 connector terminals 5 & | NO | ||
| 6 for at least 2 seconds |
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2. | Condensate Pump terminals for at | NO | ||
| least 2 seconds |
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| YES |
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| Condensate Pump runs | |||
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Replace PCB
Replace wiring
Replace Cond. Pump
Condensate drain system blocked
NO 
Replace Float Switch
YES
Clean condensate drain system
D
E
| Fan connections correct at fan. PCB - | YES | |||
| X2 connector, is 230V AC across | ||||
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| terminals 5 & 7 |
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| NO |
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E20 - Temperature sensor faulty. |
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Cold resistance approximately |
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10kΩ @ 25° C |
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(resistance reduces with increase in temp.) |
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E28 - Incorrect PCBfitted |
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Fan jammed or faulty winding
Replace PCB
Replace sensor or PCB(E28)
YES
Replace fan
F 1.
Check and correct the connection of the tube between the venturi and gas valve
G
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Gas at burner |
| Ensure gas is on and purged |
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| Replace PCB |
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| YES |
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| PCB - X3 connector is 230V AC across |
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| Replace gas valve |
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| terminals 1 & 2 |
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| voltage at PCB - X2 connector is |
| NO |
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Check and correct if necessary |
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| Replace PCB |
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1. | Ignition electrode and lead |
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| 110V AC across terminals 2 & 5 |
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| (Note: from multimeter connect |
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2. | Electrode connection |
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| YES |
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| ‘common’ to 2 & ‘volts’ to 5) |
| Replace igniter |
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3. Spark gap and position |
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| Check wiring |
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36© Baxi Heating UK Ltd 2009
