Baxi Platinum Combi 24 HE A Installation & Servicing Instructions Manual page 55

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 3 & 4
© Baxi Heating UK Ltd 2014
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
55