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TROUBLESHOOTING INSTRUCTIONS
The list of faults/causes/possible solutions for a set of main failures is a guideline for professional personell authorised to carry out
service and maintenance.
Irregular burner operation or malfunction: check that every adjustment parameter is correctly set as per instruction on this manual.
TROUBLESHOOTING TABLE
GAS OPERATION
CAUSES
Defective control box unit
No electrical power supply
Wrong electrical connections
Air pressure switch not "closed"
Boiler thermostats open
Fan motor overload intervention
Auxiliaries fuses interrupted
Servomotor [CLOSE] position
switch not reach
Minimum gas pressure swtich
not close
Leakage test successful -
signals not arrive to control unit
Leakage Test failure (VPS / VDK)
Leakage Test failure (LDU kit)
Servomotor [OPEN] position
switch not reach
Servomotor [MIN] position
switch not reach
Extraneous light
Air pressure switch fail to connect
to Terminal 14
Fan contaminated / dirty
Fan motor rotation direction
not correct
Flame supervision circuit internal
test failed
Pilot flame failure - Pilot gas valves
not open
Pilot flame establish - weak flame
signal
Ignition transformer faulty
Ignition cable & electrodes defective
Electrode bad position
Main solenoid valve fails to open
Flame sensor signal failure
Head adjustment not correct
Gas / Air mixture setting not correct
Oscillating gas pressure
Capacity reduction due to lower
gas supply pressure
Gas pressure regulator
not regulating
Load control device does not close
420010511800
REMEDIES
Replace control box unit
Check switches/contactors
Check connections
Check contacts
Check contacts
Replace Fuse
Replace Fuse
Check servomotor settings
Open manual ball valve, check
pressure switch settings, contacts,
replace if necessary
Check contacts
Clean valves or replace leakage
controller if necessary
Check contacts, clean valves or
replace leakage controller if necessary
Check servomotor settings
Check servomotor settings
Eliminate light source
Check contacts
Clean fan
Check direction and contactor
Replace control unit
Check valves contacts / replace if
necessary
Check Ionisation or flame sensor
Replace if necessary
Replace
Replace
Check setting / replace if necessary
Check contacts and clean valves
Replace valves if necessary
Clean, re-position or replace if
necessary
Check settings
Check settings
Install damping throttle (AGA 25) -
order separately or reduce suppply
pressure
Check gas pressure, clean filter,
replace cartridge if necessary
Replace regulating valve
Check load control,
replace if necessary
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LFL
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