never seen this happen before...

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donselectric

Senior Member
Location
nh
went to a call today ac not working, 90 plus out
go to the condenser and its running.. go in the house
and its blowing hot air, figured it lost its charge so i go to
the cellar and the furnace is running...
how can they both be running ?? so i shut down the service
switch the gas valve closes and the duct work begins to cool.
i pulled the power connector from the gas valve so it can't happen
again and tell them maybe a bad digital thermostat...:-? everything else
looked ok. anyone ever encounter such a thing happening ?

thanks
 
Another thing to check besides the thermostat itself being bad is to make sure that thermostat wire is not damaged. ( Iam sure that you did check this already)You may be sending signals for both heating/A-C at same time ?Who knows, may be someone put a nail thru it.
 
donselectric said:
go in the house
and its blowing hot air, figured it lost its charge so i go to
the cellar and the furnace is running...
how can they both be running ?? so i shut down the service
switch the gas valve closes and the duct work begins to cool.
i pulled the power connector from the gas valve so it can't happen
again and tell them maybe a bad digital thermostat...:-?
Click to expand...


Best idea is to shut the system down and call those that are fully qualified to work on the system. Those wonderfull HVAC technicians. ;)
 
Might be a bad contactor.You need to find out why the heat contactor is closed.This can be the therm.,wiring,contactors,control board.Have seen problem before but not often.
 
the more i think of it, maybe a relay on the furnace circuit board cause it
didn't restart after i shut down the safety and restarted it but why it called is a mystery....:confused:

thanks
 
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