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
NO
NO
Check electrical supply
Replace fuse
Check wiring
Display illuminated
NO
Replace PCB
C
1.
2.
1.
Pump | YES | If pump jammed, release |
|
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 | |
|
Check connection water pressure |
|
|
|
|
switch terminal |
|
|
|
|
| YES | Replace water | ||
COM - NO and PCB connector |
|
|
| pressure switch |
X400 terminals 3,4 |
|
|
| |
|
|
|
| |
|
|
|
| |
|
|
|
|
|
2. | Check the tap of the automatic air | NO |
| ||
Open the automatic air vent | |||||
| vent is opened |
|
| ||
|
|
|
| ||
|
|
|
| ||
|
|
|
|
| |
D 1.
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 2012 | 57 |
