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TROUBLESHOOTNG GUIDE - Gas operation
BURNER DOESN'T LIGHT
GAS LEAKAGE: BURNER LOCKS OUT
(NO FLAME)
BURNER LOCKS OUT WITH FLAME PRESENCE
BURNER CONTINUES TO PERFORM PRE-PURGE
BURNER CONTINUES TO PERFORM ALL ITS FEA-
TURES WITHOUT IGNITING THE BURNER
BURNER LOCKS OUT WITHOUT ANY GAS FLOW
BURNER LOCKS OUT AND THE CONTROL WIN-
DOW SHOWS A P
BURNER LOCKS OUT DURING NORMAL RUNNING
WHEN STARTING THE BURNER OPENS FOR A
WHILE THE VALVES AND THEN REPEATS FROM
THE BEGINNINGTHE CYCLE FROM PRE-PURGE
BURNER STANDS WHILE RUNNING WITHOUT ANY
SWITCHING OF THERMOSTATS
FAN MOTOR DOESN'T START
BURNER DOESN'T SWITCH TO HIGH FLAME
SOMETIMES THE SERVOMOTOR RUNS IN THE
WRONG WAY
* No electric power supply
* Main switch open
* Thermostats open
* Bad thermostat set point or broken thermostat
* No gas pressure
* Safety devices (manually operated safety thermostat or
pressure switch and so on) open
* Broken fuses
* Fan thermal contacts open (only three phases)
* Burner control locked out
* Burner control damaged
* Gas flow too low
* Ignition electrodes discharge to ground because dirty or
broken
* Bad electrodes setting
* Electrical ignition cables damaged
* Bad position of cables in the ignition transformer or into
the electrodes
* Ignition transformer damaged
* Bad flame detector set
* Flame detector damaged
* Bad cables of flame detector
* Burner control damaged
* Phase and neutral inverted
* Ground missing or damaged
* Voltage on neutral
* Too small flame (due to not much gas)
* Too much combustion air
* Burner control damaged
* Air servomotor damaged
* Air pressure switch damaged or bad links
* Burner control damaged
* Gas valves don't open
* Gas valves completely closed
* Pressure governor too closed
* Butterfly valve too closed
* Maximum pressure switch (if installed ) open.
* Air pressure switch doesn't close the NO contact
* Air pressure switch damaged (it keeps the stand-by
position or badly set
* Air pressure switch connections wrong
* Air fan damaged
* No power supply
* Air damper too closed
* Flame detector circuit interrupted
* Burner control damaged
* Maximum gas pressure switch damaged or badly set
* Gas pressure switch badly set
* Gas filter dirty
* Gas governor too low or damaged
* Thermal contacts of fan motor open
* Internal motor wiring broken
* Fan motor starter broken
* Fuses broken (three phases only)
* Hi-low flame thermostat badly set or damaged
* Servomotor cam badly set
* Servomotor capacitor damaged
45
PART IV: MAINTENANCE
* Wait until power supply is back
* Close the switch
* Check set points and thermostat connections
* Set or replace the thermostat
* Restore gas pressure
* Restore safety devices; wait that boiler reaches its
temperature then check safety device functionality.
* Replace fuses. Check current absorption
* Reset contacts and check current absorption
* Reset and check its functionality
* Replace burner control
* Increase the gas flow
* Check gas filter cleanness
* Check butterfly valve opening when burner is starting
(only Hi-Low flame and progressive)
* Clean or replace electrodes
* Check electrodes position referring to instruction
manual
* Replace cables
* Improve the installation
* Replace the transformer
* Replace or adjust flame detector
* Check cables
* Replace burner control
* Adjust connections
* Check ground continuity
* Take off tension on neutral
* Adjust gas flow
* Check gas filter cleanness
* Adjust air flow rate
* Replace burner control
* Replace servomotor
* Check air pressure switch functions and links
* Replace burner control
* Check voltage on valves; if necessary replace valve or
the burner control
* Check if the gas pressure is so high that the valve
cannot open
* Open valves
* Adjust the pressure governor
* Open the butterfly valve
* Check connection and functionality
* Check connections
* Check pressure switch functionality
* Check air pressure switch functionality
* Reset air pressure switch
* Check connections
* Replace motor
* Reset power supply
* Adjust air damper position
* Check wiring
* Check photocell
* Replace burner control
* Reset pressure switch or replace it
* Reset the pressure switch
* Clean gas filter
* Reset or replace the governor
* Reset contacts and check values
* Check current absorption
* Replace wiring or complete motor
* Replace starter
* Replace fuses and check current absorption
* Reset or replace thermostat
* Reset servomotor cam
* Replace capacitor
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