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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