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Check for 120 vac in boiler high
voltage terminal box.
Is 120 vac present?
NO
Check power supply to
boiler. Check breakers,
disconnect and
emergency switch for
voltage. Fix or repair
external wiring.
Remove User Interface from
base. Using Digital Voltmeter
check for 25 to 30 Vdc. Is voltage
NO
Replace Control Module
13 - TROUBLE SHOOTING
If boiler does not function.
YES
Locate fuse holder on front of
control and pull to check fuse.
Spare fuse located on controller.
Make sure all wire harness plugs
are properly pushed in. Release
plug lock with finger, remove
and reconnect all 7 plugs. Check
wiring from User Interface to Low
Voltage Terminal Strip including
checking continuity of wires. Does
User Interface Display work?
NO
present?
YES
Replace User Interface
45
Remove Jacket.
Is User Interface lit?
NO
YES
may be faulty - boiler
YES
Does display show "Standby - No
Demand?
NO
YES
There is no call for
heat or hot water.
Check thermostat.
Outdoor air sensor
in warm weather
shutdown.
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Table of Contents
Troubleshooting
