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GAS OPERATION
Problem
The burner does not start
The burner does not come on
and the lockout appears
The burner starts and then goes
into lockout
The burner turns on and then
remains in lockout mode
Once the pre-purging and the
safety time has elapsed the
burner goes into lockout without
the flame appearing
Locks out with
flame
The burner continues to repeat
the start-up cycle without lockout
Burner goes into lockout during
operation
Lockout when the burner stops
Ignition with pulsations
20174375
Faults - Possible causes - Solutions
Probable cause
• No power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . .Turn off switches - Check wiring
• A limit or safety control device is open . . . . . . . . . . .Adjust or replace it
• Flame control lockout . . . . . . . . . . . . . . . . . . . . . . . .Release
• Control box fuse broken . . . . . . . . . . . . . . . . . . . . . .Replace it
• Incorrect electrical wiring. . . . . . . . . . . . . . . . . . . . . .Check connections
• Defective flame control . . . . . . . . . . . . . . . . . . . . . . .Replace it
• No gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Open the manual valves between
• Mains gas pressure insufficient . . . . . . . . . . . . . . . . .Contact your GAS COMPANY
• Minimum gas pressure switch fails to close . . . . . . .Adjust or replace
• Air pressure switch in operating position. . . . . . . . . .Adjust it or replace it
• Flame simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace control box
Air pressure switch does not switch owing to lack of air pressure:
• Air pressure switch is badly adjusted . . . . . . . . . . . .Adjust it or replace it
• Pressure switch pressure test point pipe blocked . . .Clean
• Head incorrectly adjusted . . . . . . . . . . . . . . . . . . . . .Adjust
• Defective flame detection circuit . . . . . . . . . . . . . . . .Replace control box
• The VR solenoid valve lets too little gas through . . .Increase it
• The VR or VS solenoid valve does not open . . . . . .Replace the coil or the rectifier panel
• Gas pressure too low . . . . . . . . . . . . . . . . . . . . . . . .Increase pressure at regulator
• The pilot burner is not functioning . . . . . . . . . . . . . . .Check
• Firing transformer defective . . . . . . . . . . . . . . . . . . .Replace it
• Incorrect valve or firing transformer connections . . .Redo
them
• Defective control box. . . . . . . . . . . . . . . . . . . . . . . . .Replace
• A closed valve up-line from the gas train . . . . . . . . .Open it
• Air in pipework. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bleed air
• The VR solenoid valve lets too little gas through . . .Increase it
• Max. gas pressure switch triggered . . . . . . . . . . . . .Regulate it or replace it
• Defective control box. . . . . . . . . . . . . . . . . . . . . . . . .Replace
• The gas pressure in the network is near the value . .Reduce the cut in pressure of the min.
gas pressure switch
on which the min. gas pressure switch is adjusted.
The sudden fall in pressure that follows . . . . . . . . . .Replace the gas filter cartridge
the opening of the valve causes the temporary opening
of the pressure switch itself immediately
the valve closes and the burner stops. The
pressure starts to increase again. The pressure switch
closes and repeats the start up cycle.
And so on.
• Fault on air pressure switch . . . . . . . . . . . . . . . . . . .Replace
• Max. gas pressure switch triggered . . . . . . . . . . . . .Adjust it or replace it
• Permanence of the flame in the head of . . . . . . . . . .Eliminate the continuation of the flame
combustion simulation of flame. . . . . . . . . . . . . . . . .or replace control box
• Head incorrectly adjusted . . . . . . . . . . . . . . . . . . . . .Adjust
• Incorrectly adjusted fan air damper: too much air . . .Adjust
• Firing output too high . . . . . . . . . . . . . . . . . . . . . . . .Reduce it
36
meter and train
GB
Suggested remedy
Tab. Q
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