DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
15.6 Troubleshooting for Fan Contactor
START
Does main fan run
automatically
in heating mode?
Yes
No | Is power supply 400v at |
| No | Fault elsewhere |
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three phase and N at the |
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| main terminal? |
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| Yes |
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Does fan run when white | Is there 230v at contactor |
| Press in overload reset |
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button of combination No | No | No | |||||
thermostat is pushed in? |
| coil terminal A1 and A2? |
| button and retest. |
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| Yes |
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| Yes |
| Yes |
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| Replace |
| Contactor faulty. | Overload operated. Check for | |||
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| three phases at mains |
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combination thermostat. |
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| Replace. |
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| terminals, loose electrical |
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terminals and motor overload.
| Wiring faulty or faulty | |
| combination thermostat. | |
| Investigate. | |
| No | |
Is there 230v between | Has fuse 1 on the | |
terminals 96 and A1 on No | printed circuit board | |
the contactor? | blown? | |
Yes | Yes | |
Overload Faulty | Replace fuse and | |
investigate. | ||
Replace. | ||
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Does fan motor run with
little or no air flow?
No
Check filters and
ducting for blockage.
Yes
Does fan run
as burner fires?
Yes
Does main fan run
automatically
in cooling mode?
Yes
Yes
Fan Operating
TROUBLESHOOT ENDS.
No
If problems persist, contact ROBERTS GORDON® at Tel: +44 (0) 1902 498733 or
Yes | Are fan belts | No | Is fan/motor rotation | No | Transpose two incoming | |
loose or broken? | correct? | phase connections. | ||||
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| Yes |
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| Replace or tighten belts. |
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Relay R1 faulty.
No Replace.
No | Does fan run at cooling |
| No | Relay R2 faulty. |
stage 1 (T11 live)? |
| Replace. | ||
| Yes |
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| Does fan run at cooling | No | Relay R3 faulty. | |
| stage 2 (T12 live)? |
| Replace. | |
For your safety and optimum heater performance use only ROBERTS GORDON® replacement parts.
Conduct Commissioning procedure as on Page 21, Section 11
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