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IF YOUR SYSTEM IS NOT HEATING OR NOT GIVING ENOUGH HEAT . . .
POSSIBLE CAUSE
Thermostat is not set correctly
Burner is not operating properly
No electric power to boiler
Controls out of adjustment
Circulating pump not running
Poor electrical contact
Chimney flue is blocked
POSSIBLE CAUSE
Corrosion and/or deposits on
seat.
Water logged expansion tank
HAVE YOUR SERVICE TECHNICIAN CHECK ANY PROBLEM YOU ARE UNABLE TO CORRECT.
System Condition Diagnostic Condition
Boiler is cold,
Display off
house is cold.
Display on
Boiler is hot,
Display on
house is cold.
Burner will not
Display On
turn off.
20 - TROUBLESHOOTING
WHAT TO DO
Reset thermostat
Adjust burner per instructions.
Check over-current protection. Check to be sure electric power supply cir-
cuit is "ON". There may be as many as 3 safety shut-off switches installed.
Look for a red plate which may be on the service switch.
Reset according to instructions.
Check over-current protection. Check relay operation. Check power to
circulator.
Check all control terminals and wire joints.
Have the chimney professionally cleaned.
RELIEF VALVE LEAKING . . .
WHAT TO DO
Open valve manually. Allow water to run and clear valve seat.
Drain tank, follow instructions to provide air buffer.
LIMIT CONTROL TROUBLESHOOTING GUIDE
Check
120 VAC system power
24 VAC T-T
24 V present; disconnect
thermostat, short T-T
120 VAC at B1-B2
Low Water status light
120 VAC at C1-C2
Burner wired incorrectly. L1
(black) and Limit (red) are
reversed. See wiring diagram
for installed burner.
Action
Turn system power on
No 24 V; replace control
Boiler starts, check wiring and thermostat
• If no, replace
• 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.
60
PN 240013415 REV A [08/15/2021]
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