AC/Blower won't turn off

Old 10-07-02, 01:11 PM
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Unhappy AC/Blower won't turn off

Please help! I have a Carrier 58GP, GS or GSC or 58DP, DR, DRC (from Manual) Natural-Draft furnace. It is an upflow unit. It has an automatic intermittent ignition pilot.

The thermostat doesn't seem to be controlling the unit. I tried replacing the thermostat but the Blower and AC stays on. The only way I can shut it down is to turn off the electrical supply to the furnace. We had the coldest night this fall last night and guess what happened? NO HEAT!!! Any ideas?
Old 10-07-02, 04:29 PM
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Take thermostat off the wall, disconnect all the wires and let them hang free not touching each other. Turn the power back on to both the furnace and the outdoor unit and tell us what happens.
Old 10-07-02, 06:38 PM
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carrier fan on

have seen this caused by a bad transformer in carrier units. check what bigjohn suggests, then if possible see if the transformer is putting out 24 volts with a 115 volt input. could be fan relay on board if 24 volts is presenr between R and C
Old 10-08-02, 10:43 AM
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Blower not turning off

Yesterday morning I had the EXACT same problem with the EXACT same furnace: Carrier 58GP-100 upflow. I talked to a hvac tech who said it is probably the circuit board but he will be out this afternoon to visually inspect the unit. Every situation is different but I will keep you posted on the progress of my problem. Maybe it will help you.
Old 10-08-02, 01:17 PM
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Talking Blower Fixed!

I needed a blessing today folks and here it is: It turns out all it needed was a push of the 'reset' button on the vent safety shutoff switch. I was looking for it and could not find it. The hvac tech tested my wiring first then I mentioned I could not find the VSSS and he went right to it. The blower shuts off and the heat comes on as normal. Thank GOD that's all it was and not some major problem. It was also nice to have a good, honest tech find the problem and solve it quickly but in the future I will CHECK THE SHUTOFF SWITCH FIRST!

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