Basement Air Fan runs continuously - Printable Version

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+--- Thread: Basement Air Fan runs continuously (/showthread.php?tid=6715)

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Basement Air Fan runs continuously - Glenn Brooks - 04-06-2022

First time post. Purchased coach 445 1997 a year ago which needed some long overdue TLC. Needless to say, it has been quite the learning experience familiarizing myself with all the intricacies of each operating system. I received no manuals or pamphlets on how each system works. This site has been a wealth of information helping me fix some  of the problems. One of my many fixes was the central basement a/c unit. I removed the unit from the coach and rebuilt it. I replaced both condenser and evaporator motors, fan blades, capacitors, and relays. I moved the relays off the board per suggestions from other members. I re-installed the unit and fired it up. Everything works great except the evaporator fan runs continuously even when the thermostat is in the off position. Does anybody have any suggestions as to why the fan runs all the time?

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RE: Basement Air Fan runs continuously - HoosierDaddy - 04-06-2022

Welcome Glenn! There are others more knowledgeable than me but my first thought would be to re-check the wiring at those relays. It might help to know the brand of the a/c units in your Newell.

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RE: Basement Air Fan runs continuously - Richard - 04-07-2022

Hi Glenn,

You would have the SCS basement units from the year coach and your description.

So that I don’t make any wrong assumptions in trying to help you. Can you provide some specificity about what you did?

Did you add external relays for the compressors?
Did you replace the relays on the boards for the fans?
Would you disconnect the GL1 and GL2 wires from the back of the thermostat? It is quick and easy, and will eliminate any potential internal issues with the Tstat.

Would you post pics of the control board please.

Nice work BTW. I like the preventative care. I did the same. My wife does NOT like to be hot.

If you got the neutral and the hots reversed on the fan motor, it could be making a circuit from hot to ground and bypassing the relay altogether.

If you replaced the relays on the board, some solder could have inadvertently bridged a circuit.
The relay could be welded shut.

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