Dunkirk Helix VX Vertical Laser Tube Wall Hung Stainless Steel Modulating Condensing Boiler User Manual

Page 46

13 - TROUBLE SHOOTING

Remove Jacket.

Is User Interface lit?

YES

Check for 120 vac in boiler high

voltage terminal box.

Is 120 vac present?

Check power supply to

boiler. Check breakers,

disconnect and

emergency switch for

voltage. Fix or repair

external wiring.

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?

Remove User Interface from

base. Using Digital Voltmeter

check for 25 to 30 Vdc. Is voltage

present?

Does display show "Standby - No

Demand?

There is no call for

heat or hot water.

Check thermostat.

Outdoor air sensor

may be faulty - boiler

in warm weather

shutdown.

GO TO NEXT PAGE

YES

Replace Control Module

Replace User Interface

If boiler does not function.