Baxi Potterton LPG Service Manual download pdf (Page 50)

50

18.0 Fault Finding

© Baxi Heating UK Ltd 2008

Fault Finding Solutions Sections

Is there 230V at:

Is there 230V at:

Main terminals L and N Check electrical supply

1.

NO

Main terminal fuse

Replace fuse

Replace PCB

Display

illuminated

2.

NO

PCB - X1 connector

terminals 1,2

Check wiring

3.

NO

NO

A

Pump Replace pump

1.

YES

PCB - X3 connector terminals 3 & 4

Replace PCB

2.

NO

Change pump supply cable

YES

B

CH system pressure less than 0.5 bar Re-pressurise system

1.

YES

Check the tap of the automatic air

vent is opened

Open the automatic air vent

2.

NO

C

1.

NO

YES

Fan connections correct at fan. PCB -

X2 connector, is 230V AC across

terminals 5 & 7

Fan jammed or faulty winding

Replace PCB

Replace fan

YES

D

If pump jammed, release

NO

NO

Replace water

pressure switch

Check connection water pressure

switch terminal

COM - NO and PCB connector

X400 terminals 3,4

YES

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