Potterton HE Plus Installation & Service Instructions Manual page 50

Fault Finding Solutions Sections
A
Is there 230V at:
1. Main terminals L and N
2.
Main terminal fuse
3.
PCB - X1 connector
terminals 1,2
B
Is there 230V at:
YES
1.
Pump
2. PCB - X3 connector terminals 3 & 4
YES
Change pump supply cable
C
1.
CH system pressure less than 0.5 bar
2.
Check the tap of the automatic air
vent is opened
D
1.
Fan connections correct at fan. PCB -
X2 connector, is 230V AC across
terminals 5 & 7
50
© Baxi Heating UK Ltd 2007
Supplied By www.heating spares.co Tel. 0161 620 6677
NO
NO
NO
NO
If pump jammed, release
NO
YES
NO
Check connection water pressure
switch terminal
COM - NO and PCB connector
X400 terminals 3,4
NO
YES
NO
18.0 Fault Finding
Check electrical supply
Replace fuse
Check wiring
Replace pump
Replace PCB
Re-pressurise system
YES
Open the automatic air vent
Fan jammed or faulty winding
Replace PCB
NO
Display
Replace PCB
illuminated
Replace water
pressure switch
YES
Replace fan