Potterton Performa 24 Eco HE Installation & Service Instructions Manual page 50

Fault Finding Solutions Sections A to F
A
Is there 230V at:
1.
Main terminals L and N
2. Main terminal fuse
3.
Selector terminals a & b and a
& 3. PCB - M1 connector
terminals 9 & 10
B
Is there 230V at:
1.
Pump
2. PCB - M1 connector terminals 8 & 15
YES
Change pump supply cable
C
1. CH system pressure 0.5 to 1.5 bar
2.
Check the tap of the automatic air
vent is opened
3.
Primary flow valve diaphragm damaged
D
1.
Continuity across flow
microswitch and PCB M2
connector terminals 3 & 4
2.
Primary temperature sensor faulty.
Cold resistance approx. 11K ohms
(resistance reduces with increase in temp.)
3.
Fan connections correct at fan.
PCB - M5 connector, is 230V
across terminals 28 & 29
E
Check and correct if necessary
1. Electrical and pressure tube connections
2. Blockage of pressure tubes
3. Restriction in flue
4. Venturi
F
NO
Gas at burner
50
© Baxi Heating UK Ltd 2009
NO
YES
NO
If pump jammed, release
NO
NO
NO
NO
NO
YES
NO
NO
Ensure gas is on and purged
PCB - M4 connector is approx 230V AC, terminals
36 & 38
NO
neon illuminated
NO
Replace PCB
Check electrical supply
Replace fuse
Check wiring
Replace selector
NO
Replace pump
Replace PCB
Re-pressurise system
Open the automatic air vent
YES
Replace diaphragm
Flow valve rod obstructed
Replace microswitch
YES
Replace sensor
Fan jammed or faulty winding
Replace PCB
Replace air pressure
switch
YES
YES
Turn selector switch to
'Reset' position
16.0 Fault Finding
NO
neon
illuminated
YES
Replace fan
Replace gas valve
Replace PCB