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Thermostat is notsetcorrectly
Reset t hermostat
Burner i s notoperating properly
Adjust b urner perinstructions.
Check over-current protection. Check to besureelectric power s upply cir-
Noelectric power t o boiler
cultis "ON". T heremaybeas manyas3 safetyshut-off s witches i nstalled.
Look fora redplatewhichmaybeontheservice switch.
Controls outof adjustment
Reset a ccording t o instructions.
Check over-current protection. Check relayoperation. Checkpower t o
Circulating p ump notrunning
circulator.
Poorelectrical contact
Check allcontrol t erminals a ndwirejoints.
Chimney f lueis blocked
Have thechimney professionally cleaned.
Corrosion and/or d eposits onseat.
Waterlogged expansion t ank
Openvalvemanually. Allow watertorunandclearvalveseat.
Drain tank,followinstructions toprovide airbuffer.
Boiler is cold,
house is cold.
Boiler is hot,
house is cold.
Burner will not
turn off.
Display off
Display on
Display on
Display On
120 VAC system power
Turn system power on
24 VAC T-T
No 24 V; replace control
24 V present; disconnect
Boiler starts, check wiring and thermostat
thermostat,
short T-T
L
120 VAC at B1-B2
•
If no, replace
Low Water status light
120 VAC at C1-C2
•
If yes, check burner and wiring
If illuminated,
find and repair water
leak(s).
120 vac at C1-C2, check wiring to
pump
Wiring OK, is pump running?
If not, replace pump.
If pump is running, check for trapped
air or closed zone valves.
Re-Wire burner.
Burner wired incorrectly.
L1
(black) and Limit (red) are
reversed. See wiring diagram
for installed burner.
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