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21. Incorrect function
20. Gas conversion
I
f the boiler is not set for the gas type, converson kits are available. To convert the boiler, please use exclusively MTS parts and
proceed as it is mentioned in the instruction manual provided with the conversion kit.
If these solutions do not cure the fault, call a qualified professional
Fault Cause Solution
T
he boiler doesn’t start
No gas, no water or no
e
lectricity
C
ontrol gas, water and electrical
supply, fuses…
Air in the gas pipe Purge the air from the gas pipe
Room thermostat switched off Turn the room thermostat up
Red indicator alight
Overheat lockout (A01)
No flame after safety time (A03)
No flame detected (E04)
Flame lift (E18)
Wait for a few minutes
Press the reset button
29 (Fig. 114) the red led goes out
and the boiler attempts to re-light.
If the red indicator lights too frequently, please call your
local service centre.
Noises in CH system
Air presence in CH system or.
Insufficient pressure
Purge the system of air (Section 14.2, page 28) and
increase the system pressure (Section 2, page 6)
Radiators rise in temperature
During summer season
Gravity effect in the CH system
Close the heating flow isolating valve (41 Fig. 2, page 5).
Don’t forget to open it again before starting the heating.
If after A01 fault and with cold
boiler, The boiler doesn’t start
Overheat lockout (A01)
Check the thermo fuse on the right top on the heat
exchanger. With an open thermo fuse, a replacement of
all the heat exchanger is required.