Baxi Combi Instant 80e Installation & Servicing Instructions Manual page 47

Fault Finding Solutions
I
Ensure that mains input terminal L
is Live (230V) and N is Neutral
(0V)
YES
Check and correct if necessary
1. Flame sensing electrode and lead connections
2. Flame sensing electrode position
Flame current should be 1 µA approx.
J
Overheat thermostat operated or
faulty, i.e. continuity across
thermostat terminals
YES
K
Check terminal 1 of ON/OFF/RESET selector is in
connection with PCB - A4 connector terminal 2
Check electrical continuity across terminals 1 & a on reset
selector when turned to position
L
Check continuity of loop on
A10 connector
M
Is there 230V at:
Diverter valve operating head
1.
2.
PCB - A8 connector terminals 1
& 5 central heating function
1 & 3 DHW function
YES
Change motor supply cable
YES
NO
Allow to cool. Continuity
NO
across thermostat terminals
more than 1.5 ohm
Replace main PCB
R
Replace main PCB
YES
NO
14.0
Replace main PCB
Replace flame sensing electrode
YES
NO
Replace ON/OFF/RESET selector
YES
Replace main PCB
Replace diverter valve operating head
Replace main PCB
Fault Finding
Replace overheat
thermostat
47