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INSTRUCTIONS— GAS AIR HEATER -
MINIGAZ Eco
MH Eco, MC Eco, MV Eco– NT09004I-GB – 29/11/2017
In Case of problem, check that the preliminary conditions of operation are fulfilled;
If the control box is faulty (burner signal lamp switched on), reset it.
CAUTION: Before any electrical or mechanical maintenance operation, switch off electrical and gas
supply.
11– FAULT FINDING
Faults
Causes
Solutions
Gas air heater does not
start
-
Wiring mistake
-
Voltage lack
-
Ambient air thermostat not in operation
-
Overheat air pressure switch is on
-
Check wiring
-
Check voltage supply
-
Increase set point of the ambient air ther-
mostat
-
Reset the air pressure switch
Continuous pre-ventilation
mode of the exhaust fan
-
Exhaust fan out of order
-
Pressure switch disconnected
-
Pressure switch out of order
-
Replace the exhaust fan
-
Reconnect the pressure test pipes
-
Replace pressure switch
Light-up electrode runs
normally, burner is also
running but burner safety
relay is on security mode
(signal light on)
-
Faulty gas valve
-
Faulty burner safety relay
-
Faulty ionisation electrode or bad adjust-
ment of it
-
Air in gas pipes
-
No gas
-
Replace it
-
Replace it
-
Adjust or replace it
-
Purge the gas pipes
-
Check gas pressure
Appliance on safety mode
(red light on)
-
No gas supply
-
Reset the red button on the safety relay
Cold air when fan operat-
ing
-
Bad adjustment of the fan air pressure
switch
-
Adjust the set point of the air pressure
switch (35°C)
Insufficient heat output
-
Bad position of ambient air thermostat
-
Bad adjustment of the thermostat
-
Lack of gas pressure
-
inappropriate injectors
-
Install it in an appropriate position
-
Adjust the set point of the thermostat
-
Check gas pressure
-
Select the good injectors and replace
them
Air heater always in opera-
tion
-
Thermostat set point too high or out of
order
-
Wiring mistake
-
Adjust the set point temperature or replace
it
-
Check the wiring