Potterton Performa 24i HE Installation And Service Instructions Manual page 46

Fault Finding Solutions
A
Is there 230V at:
1.
Main terminals L and N
2.
Main terminal fuse
3. Selector terminals a & b
and a & 3. PCB - A4
connector terminals 4 & 5
B
Is there 230V at:
YES
1.
Pump
2.
PCB - A4 connector terminals
YES
Change pump supply cable
C
1. CH system pressure 0.5 to 1.5 bar
2.
Check automatic air vent is
open
3. Primary flow valve diaphragm damaged
D
1.
Continuity across flow
microswitch and PCB - A5
connector terminals 7 & 8
2.
Temperature sensor faulty.
Cold resistance approx. 11 kΩ
(resistance reduces with increase in temp.)
3.
Fan connections correct at fan.
PCB - A2 connector 230V
across terminals 5 & 7
46
NO
YES
NO
If pump jammed, release
NO
NO
NO
YES
NO
NO
YES
NO
15.0 FAULT FINDING
Check electrical supply
Replace fuse
Check wiring
Replace selector
NO
Replace pump
Replace main PCB
Re-pressurise system
Open the automatic air vent
Replace diaphragm
Flow valve rod obstructed - clean, reset
Replace microswitch
YES
Replace sensor
Fan jammed or faulty winding
Replace main PCB
NO
neon
Replace main PCB
illuminated
YES
Replace fan
Publication No. 5111813