Unigas E115X Installation Manual page 44

TROUBLESHOOTNG GUIDE Gas operation
BURNER DOESN'T LIGHT
GAS LEAKAGE: BURNER LOCKS OUT
(NO FLAME)
BURNER LOCKS OUT WITH FLAME PRESENCE
only FOR LME22: BURNER CONTINUES TO PER-
FORM ALL ITS FEATURES WITHOUT IGNITING
THE BURNER
BURNER LOCKS OUT WITHOUT ANY GAS FLOW
THE BURNER IS BLOCKED AND THE EQUIPMENT
PROVIDES A LOCK CODE "CAUSE AIR PRESSURE
SWITCH FAULT"
BURNER LOCKS OUT DURING NORMAL RUNNING
THE BURNER STARTS AND AFTER A WHILE IT
REPEATS THE STARTING CYCLE.
BURNER STANDS WHILE RUNNING WITHOUT ANY
SWITCHING OF THERMOSTATS
FAN MOTOR DOESN'T START
BURNER DOESN'T SWITCH TO HIGH FLAME
mechanical only: SOMETIMES THE SERVOMOTOR
RUNS IN THE WRONG WAY
PHASE-TO-PHASE SUPPLY OR PRESENCE OF
VOLTAGE ON NEUTRAL*
PART V: MAINTENANCE
* 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,
pressure switches and so on) open
* Broken fuses
* Fan thermal contacts open (three phases motors only) * Reset contacts and check current absorption
* Burner control lock out
* Burner control damaged
* Gas flow is 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
* Wrong setting of flame detector
* 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
* 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 closed
* Maximum pressure switch 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
* Lights up and freezes
44
* Restore power supply
* Close switch
* Check set points and thermostat connections
* Reset or replace the thermostat
* Restore gas pressure
* Restore safety devices; wait till boiler reaches operating
temperature then check safety device functionality.
* Replace fuses. 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
* Adjust flame detector
* Replace 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
* 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
* In such cases, insert an RC circuit (our code 2531003).