18.0 Fault Finding
Fault Finding Solutions Sections
A
B
Is there 230V at:
1.Main terminals L and N
2.Main terminal fuse
3.PCB - X1 connector terminals 1,2
Is there 230V at:
NO | Check electrical supply |
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NO | Replace fuse |
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NO Check wiring
Display illuminated
NO
Replace PCB
C
1.
2.
1.
Pump | YES | If pump jammed, release |
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PCB - X3 connector terminals 3 & 4
YES
Change pump supply cable
CH system pressure less than 0.5 bar
NO
NO
Replace pump
NO Replace PCB
YES | |
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Check connection water pressure |
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switch terminal |
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| YES | Replace water | ||
COM - NO and PCB connector |
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| pressure switch |
X400 terminals 3,4 |
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2. | Check the tap of the automatic air | NO |
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Open the automatic air vent | |||||
| vent is opened |
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D1.
Fan connections correct at fan. PCB - X2 connector, is 230V AC across terminals 5 & 7
NO
YES
Fan jammed or faulty winding
Replace PCB
YES
Replace fan
© Baxi Heating UK Ltd 2008 | 55 |