SERVICING AND MAINTENANCE INSTRUCTIONS
_
Fault
Description
Possible
Cause
Solution
Code
01
Flame lock-out
BOILER FAILS TO FIRE
a.
No gas / gas turned off
b.
Ignition electrode damaged or earthed
c.
Electronic ignition board S4565QM faulty
d.
Gas valve faulty
e.
Minimum mechanical gas setting too low (onto the gas valve) or
slow ignition
f.
Inlet gas pressure excessive (only for LPG boilers)
g.
Condensate trap obstructed
BOILER FIRES THEN LOCKS OUT
h.
Reversed polarity (Live - Neutral)
i.
Ionisation electrode broken
j.
Ionisation electrode cable disconnected/detached
k.
Electronic ignition board S4565QM faulty
a.
Check gas supply / open the gas
cock
b.
Replace it
c.
Replace it
d.
Replace it
e.
Re-set the mech. min gas pressure
or slow ignition
f.
Check gas supply pressure (gas
valve inlet)
g.
Clean it
h.
Check and reverse
i.
Replace it
j.
Re-connect it
k.
Replace it
02
Safety Thermostat
(95°C)
l.
Thermostat broken or out of setting/calibration
m.
Thermostat cable disconnected
l.
Replace it
m.
Check electric connection
03
Flue safety thermostat
(for open chamber
boilers only)
n.
Insufficient length of flue pipe, or too small diameter or pipe
obstruction
o.
Thermostat cable disconnected
n.
Check the flue pipe
o.
Check cable connection
04
Water deficiency in
the system
p.
Water pressure in the system insufficient (stop below 0.5 bar)
q.
Water pressure switch cable disconnected
r.
Water pressure switch broken
p.
Fill the system
q.
Check cable connection
r.
Replace it
05
Heating sensor
s.
Sensor faulty or out of calibration (resistance value 10kohm at 25°)
t.
Sensor cable disconnected or wet
s.
Replace it
t.
Check cable connection
06
Domestic Hot water
sensor
u.
Sensor faulty or out of calibration (resistance value 10kohm at 25°)
v.
Sensor cable disconnected or wet
u.
Replace it
v.
Check cable connection
12
Domestic Hot water
sensor - storage
w.
Sensor broken or out of calibration (resistance value 10kohm at
25°C)
w.
Check cable connection
14
Air pressure switch
Water pressure switch
x.
Air pressure switch broken
y.
Flue exhaust / air intake ducts obstructed
z.
Exhaust fan venturi pressure point obstructed/dirty
aa.
Air pressure switch cable disconnected
bb.
Water pressure switch broken
cc.
Water pressure switch cable disconnected
x.
Replace it
y.
Check flue exhaust and air intake
ducts
z.
Check it
aa.
Check electric connection
bb.
Replace it
cc.
Check electric connection
22
Parameter setting
demand
dd.
Microprocessor memory loss
dd.
Re-set parameters
CONDENSING WALL-HUNG BOILER – TG05A062.A0505
39
