The fan switch “auto”–furnace doesn’t start
#1
10-14-05, 06:13 AM
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The fan switch “auto”–furnace doesn’t start
I replaced the old thermostat with a new programme NOMA 5+1+1 this summer. The furnace is old . The AC worked fine but I have not tried the furnace until now. The thermostat has a "heat/off/cool" switch and fan switch "on/auto". If the fan switch is “on”, the furnace works with the fan. However, if the fan switch is “auto”, the fan works but the furnace does not start regardless of the set temperature.
What could it be? Did I mess up with the wires?
What could it be? Did I mess up with the wires?
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#3
10-14-05, 09:14 AM
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Gas furnace
The fan works in both modes, but if the fan is in “auto” mode, the furnace does not kick in. However, if I change the fan to the “manual on” mode, the fan and furnace work together. It is gas furnace.
#4
10-16-05, 08:54 PM
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Ok, is the burners kicking on, if you have the fan in "AUTO"? if the burners turns on, sounds like you don't have yoru heating speed on the fan motor.. (If the fanisn't running, is the duct hot?)
now when you turn it to "ON" the fan is using another speed... Now that you have air movent, the high limit is letting the burners run.
now when you turn it to "ON" the fan is using another speed... Now that you have air movent, the high limit is letting the burners run.
#5
10-16-05, 09:20 PM
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No, the burners are not kicking on if the fan is “Auto”. Once the fan is changed to manual “ON”, both the burners and fan kick in. When the temperature is reached, the burners are off but the fan is running because it is in manual “ON” position. The Auto position does nothing, although on the thermometer it is sending a signal, heat is flushing, to the furnace.
#6
10-17-05, 04:39 PM
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Originally Posted by stepicz
No, the burners are not kicking on if the fan is “Auto”. Once the fan is changed to manual “ON”, both the burners and fan kick in. When the temperature is reached, the burners are off but the fan is running because it is in manual “ON” position. The Auto position does nothing, although on the thermometer it is sending a signal, heat is flushing, to the furnace.
Phil
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