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SECTION 15: TROUBLESHOOTING
35
15.6 Troubleshooting for Fan Contactor
Replace
combination thermostat.
Wiring faulty or faulty
combination thermostat.
Investigate.
If problems persist, contact
ROBERTS GORDON
®
at
Tel: +44(0) 190 249 8733
or www.rg-inc.com
Relay R3 faulty.
Replace.
Does fan run at cooling
stage 2 (T12 live)?
No
Does fan run at cooling
stage 1 (T11 live)?
Ye s
No
No
Replace or tighten belts.
Transpose two incoming
phase connections.
Is fan/motor rotation
correct?
No
Overload Faulty
Replace.
Are fan belts
loose or broken?
Ye s
No
No
Ye s
Has fuse 1 on the
printed circuit board
blown?
No
Ye s
No
Ye s
Press in overload reset
button and retest.
Fan Operating
TROUBLESHOOT ENDS.
No
Does fan run when white
button of combination
thermostat is pushed in?
Fault elsewhere
Is power supply 400v at
three phase and N at the
main terminal?
No
Ye s
START
No No
Ye s
Does main fan run
automatically
in heating mode?
No
Is there 230v at contactor
coil terminal A1 and A2?
Does fan motor run with
little or no air flow?
Ye s
Ye s
No
Is there 230v between
terminals 96 and A1 on
the contactor?
Contactor faulty.
Replace.
Replace fuse and
investigate.
Ye s
Overload operated. Check for
three phases at mains
terminals, loose electrical
terminals and motor overload.
Check filters and
ducting for blockage.
Does fan run
as burner fires?
No
Ye s
Relay R1 faulty.
Replace.
Ye s
Does main fan run
automatically
in cooling mode?
Relay R2 faulty.
Replace.
Ye s
For your safety and optimum heater performance use only ROBERTS GORDON
®
replacement parts.
Conduct Commissioning procedure as on Page 21, Section 11