Update on oil furnace unit?
Q: I have a furnace oil tank and the company I bought it from told me it was full and they changed out a compressor. The furnace started right away after that. I installed a larger oil tank because of the pressure difference and all the oil it’s using to keep the compressor working. Now the furnace starts and runs just fine, but about half the time it shuts off. The thermostat has an overheat protection feature so it shouldn’t blow out the furnace or shut off the furnace altogether but it does shut down. If the temperature gets cold enough, the door opens and I have to wait for the furnace to kick back on and then reset the thermostat. I’m thinking if I need to replace the thermostat. I have a warranty on it but I know if I have it installed I can’t get it replaced as long as the unit is still under warranty. I could take it somewhere but this is not something I can easily take my pets to.
Heating system startup issues
A: A timing issue between the thermostat and the thermostat motor that control the furnace needs to be investigated. The thermostat motor is normally at the rear of the furnace and the thermostat control plate usually above the motor, so any oil build up in between the thermostat and the motor can build up pressure and restrict the movement of the motor. The thermostat needs to be inspected and if there is any oil trapped between the thermostat and the motor it needs to be removed or the motor needs to be serviced and/or replaced.
If you think you have been using a smaller oil tank for a while you can add another 1/2 gallon of oil to help reduce the pressure between the thermostat and the motor. Also, if the thermostat motor does need a repair, the repair technician will likely start with that and not attempt to repair the thermostat itself if there is an oil problem. The problem with the thermostat is that there is so much oil between the thermostat and the motor that it can’t allow the thermostat to control the heating.
The oil furnace component may have been poorly constructed, but the thermostat might not be causing this issue. It may be related to a short in the distribution panel that supplies the oil to the furnace. A short in the wires could cause the motor to lose power and may allow oil to build up between the thermostat and the motor. As you can see it’s a mystery. Either way, it should be repaired.
If your are facing Heating system startup issues or get prepared for winter, read more Fall Is The Best Time For Heating System Maintenance In Alexandria VA
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