21
Six Flashes – Main Air Mover Does Cycle On
The information below is related to situations where the main air mover DOES cycle on:
Unit Sequence:
• Green light on, call for heat, power exhauster cycles on, fan motor cycles on,
green light ashes six times
Possible Causes:
• Open contacts due to over-ring of unit (ame roll out switches and some
limit switches are manual reset)
– Check gas pressure
– Check to make sure nothing is blocking the airow of the unit
– Wire off limit or ame rollout switch
¨ Limit or ame rollout switch shorting to the unit
¨ Defective limit or ame rollout switch
• Verify and replace
• Defective board
– Not letting 24 VAC through limits
– For more information on xing or replacing a defective board,
reference page 23.
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