New Fan timer runs fan with heat

Old 02-26-20, 09:29 AM
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New Fan timer runs fan with heat

Afternoon all,
replaced old faulty watsco fan timer with icm-251 fan timer. Wired up same as watsco (guessing on which was com. and NO). Fan starts as soon as burner fires. What did I do wrong?


Last edited by Sleeprtsi; 02-26-20 at 09:40 AM. Reason: Pictures?
Old 02-26-20, 08:33 PM
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You have three wires connecting to the control part of the time delay module.
How are we supposed to know their function ?
I'd say you have the wires in the wrong place or quite possibly that 151 won't replace the watsco relay.

All guesses.
The last Watsco I worked with had four terminals..... not three.

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