WarmFlow B-Series B70, Owner'S Manual

Page: 60 / 76

Page 58
11.0 Combi Fault Finding
11.1 Central Heating
YES YES
YES
NO
YES
YES
NO
YES
NO
NO
NO
Switch on power,
set selectors
for CH on and
DHW off.
Set all controls
to call for heat.
Does the
burner fire?
Is lockout lamp
on burner or
panel lit?
Is high limit
thermostat
lamp lit?
Is there continuity
across the boiler
stat connections
17 and 18 on the
PCB?
Is there continuity
across the
connections
28 and 30 on
the PCB?
Check power
from clock or
switch, check
wiring fuses and
mains supply.
Refer to burner
fault finding.
Press reset
button, replace
if necessary.
Check wiring,
replace boiler
thermostat.
Check relay and
PCB, replace if
necessary.
Do radiators
get hot?
Does boiler
cycle on its
thermostat?
Check all valves
are open and
pump is working,
check pressure,
check all air is
vented.
Check boiler
thermostat,
replace if
necessary.
HEATING IS
WORKING
NORMALLY
NO
NO
YES