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Old 10-12-2010, 10:39 AM   #1
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blower fan runs continuous, Baystat 239 tstat


The air handler runs continuously, will not shut off no matter how I set the Trane Weathertron Baystat 239 thermostat. This problem has only recently started. I would like to start at the thermostat in my search for a resolution to this problem. Anyone know how to test this tstat in trying to resolve it it is faulty and causing the air handler to run continuously? I have read that disconnecting the G(green) wire or the R(red) wire are ways to determine if the tstat has gone bad. Can it be checked with a multimeter? If so how? The outside heat pump shuts off normally when indoor temp is reached, but the air handler will not shut off. Setting the Heat/Off/Cool switch to 'Off' has no effect.

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Old 10-12-2010, 10:50 PM   #2
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blower fan runs continuous, Baystat 239 tstat


You can measure for 24VAC between C and G, then measure between C and W (at the air handler). 24 volts should not be present with no demand.


(Color codes vary)


The problem is probably a faulty heat sequencer or circuit board.


High voltage is always present at sequencers, it may be safer to call a pro.

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Old 10-13-2010, 09:44 AM   #3
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blower fan runs continuous, Baystat 239 tstat


Baystat 239 Wiring is as follows:

X2 - Brown
O - Orange
G - Green
Y - Yellow
T - Black
R - Red
W - White
U - Empty (Jumpered to W)
F - Empty
B - Blue

Voltage measured at the thermostat across B and G is 0 (zero) with the Heat/Off/Cool switch in the Off position and the air handler blower fan running. The air handler blower fan can only be shut off at the main circuit panel. The Green wire was removed from the connector on the thermostat and left disconnected for several minutes and the air handler blower fan continued to run. This would seem to indicate that the thermostat is ok. Not sure why no voltage is measured across B and G on the thermostat.
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