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23
T
ABLE I
TABLE III
DISPLAY
A01
A02
A03
A07
A19
A20
A21
A22
A33
A99
C
AUSE
Too many attempts to ignite on starting up
After three attempts at ignition, no increase in ∆T was detected
The heating flow temperature exceeds 100°C during operation
Too many failures to flame in one period during operation
The flame was detected after the gas valve had closed
The flame was detected before the gas valve opened
The flow switch does not close
The flow switch does not open
Problem with the fan
Problem with the electronic monitoring
TABLE II
DISPLAY
E03
E56
E66
E04
E05
E08
E20
E21
E22
E23
E64
E74
E99
C
AUSE
Flow temperature over 100°C while boiler is not in operation
(stand-by)
Heating flow temperature probe in open circuit
Heating flow temperature probe
Domestic hot water temperature probe in open circuit
Domestic hot water temperature probe in short circuit
Under floor heating temperature probe in open circuit
Flame detected with gas valve closed
Error in the electrical connection (live and neutral crossed)
Problem with the 50Hz power supply
Flame detection electrode short-circuited
Heating return temperature probe in open circuit
Heating return temperature probe in short circuit
Problem within the electronic system
F
AULTS
1. Drawing D.H.W:
Radiators heat up in summer
mode
2. Drawing D.H.W:
Insufficient hot water temperature
3. Drawing D.H.W:
Noisy operation
4. Decrease/increase heating circuit
pressure
5. When cold water tap turned off, the
boiler ignites
6. Insufficient radiator temperature
P
OSSIBLE CAUSES
- faulty 3-way valve
- check C.H./D.H.W. temperature probes
- check gas pressures
- check water flow rate
- check secondary heat exchanger
- primary heat exchanger faulty or lime-scale deposits
- low heating system water pressure
- check gas pressures
- check C.H./D.H.W. temperature probes
- check for leaks on the heating circuit
- faulty filling-loop
- faulty secondary heat exchanger
- expansion vessel faulty
- drop in pressure in the water mains, with
consequent water hammer
- check C.H. temperature probe
- check by-pass
- check gas pressures