Baxi Potterton 80 HE - Manual (Page 46)

46
14.0 Fault Finding
Fault Finding Solutions
Is there 230V at:
Is there 230V at:
Main terminals L and N Check electrical supply 1.
NO
Main terminal fuse Replace fuse
Replace main PCB
neon
illuminated
2.
YES
Selector terminals a & b and a
& 3. PCB - A4 connector
terminals 4 & 5 Check wiring
Replace selector 3.
NO
NO
A
Pump Replace pump 1.
YES
PCB - A4 connector terminals Replace main PCB 2.
NO
Change pump supply cable
YES
B
CH system pressure 0.5 to 1.5 bar Re-pressurise system 1.
NO
Primary flow valve diaphragm damaged Replace diaphragm
Flow valve rod obstructed - clean, reset
3.
YES
Check automatic air vent is open Open the automatic air vent
2. NO
NO
C
YES
Continuity across flow
microswitch and PCB - A5
connector terminals 7 & 8
Replace microswitch
1.
NO
NO
Temperature sensor faulty.
Cold resistance approx. 11 kΩ
(resistance reduces with increase in temp.)
Replace sensor
2.
YES
Fan connections correct at fan. PCB
- A2 connector 230V across
terminals 5 & 7
Fan jammed or faulty winding
Replace main PCB
Replace fan
YES
3.
D
If pump jammed, release
NO