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20. Gas conversion
If 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.
21. Incorrect function
Fault
The boiler doesn't start
Red indicator alight
Noises in CH system
Radiators rise in temperature
During summer season
If after A01 fault and with cold
boiler, The boiler doesn't start
56
Cause
No gas, no water or no
electricity
Air in the gas pipe
Room thermostat switched off
Overheat lockout (A01)
No flame after safety time (A03)
No flame detected (E04)
Flame lift (E18)
Air presence in CH system or.
Insufficient pressure
Gravity effect in the CH system
Overheat lockout (A01)
If these solutions do not cure the fault, call a qualified professional
Solution
Control gas, water and electrical
supply, fuses...
Purge the air from the gas pipe
Turn the room thermostat up
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.
Purge the system of air (Section 14.2, page 28) and
increase the system pressure (Section 2, page 6)
Close the heating flow isolating valve (41 Fig. 2, page 5).
Don't forget to open it again before starting the heating.
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.
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