Baxi Potterton 24 Eco HE manual Fault Finding Solutions Sections a to E

15.0 FAULT FINDING

Fault Finding Solutions Sections A to E

A

Is there 230V at:

1. Main terminals L and N

NO

Check electrical supply

2. Main terminal fuse

YES

Replace fuse

neon

NO

Replace PCB

3. Selector terminals a & b and a & 3. PCB - M1 connector terminals 9 & 10

NO

Check wiring Replace selector

illuminated

B

Is there 230V at:
			NO
1.
	Pump	If pump jammed, release

Replace pump

2. PCB - M1 connector terminals 8 & 15

YES

Change pump supply cable

NO

Replace PCB

C 1.

CH system pressure 0.5 to 1.5 bar

NO

Re-pressurise system

2.

3.

Check the tap of the	NO
automatic air vent is opened

Primary flow valve diaphragm damaged

NO

YES

Open the automatic air vent

Replace diaphragm

Flow valve rod obstructed

D	1.			NO
		Continuity across flow
		microswitch and PCB M2
		connector terminals 3 & 4
	2.
		Primary temperature sensor faulty.				YES
		Cold resistance approx. 11K ohms
		(resistance reduces with increase in temp.)
	3.
		Fan connections correct at fan.			YES
		PCB - M5 connector, is 230V
		across terminals 28 & 29
			NO

Replace microswitch

Replace sensor

Fan jammed or faulty winding

Replace PCB

YES

Replace fan

Publication No. 5111811 43