Philco Furnace Not Heating. Your furnace isn’t heating properly and you’ve lost trust in the repairman who fixed it yesterday.
There is no need to worry because, in this case, there are a few things you can try before calling a professional.
First and foremost, remain calm while contemplating what steps to take next. A bit of patience might be in order before trying anything else, especially after many frustrating attempts.
Take a look at some of our great suggestions below that may help get your home heating system working like new again without having to invest too much time or money into repairs.
Philco Furnace Not Heating
If the flame sensor detects no flame, the main control board will shut off electricity to it and thereby preventing gas from getting ignited.
This is to avoid any problems such as a fire. Often times if an individual has a dirty flame sensor, it can give false readings to the control board calling for ignition allowing unburned fuel gases to spill out into one’s home.
We discuss some problems with Philco furnaces here when they don’t heat up.
Issue With Pressure Switch
The pressure switch automatically closes when the burner has the proper amount of airflow.
If the pressure relief switch is not working properly, it might not close completely when there is sufficient airflow coming in, causing you to experience difficulty in starting.
In order for you to test if the pressure relief switch is defective, use a multimeter to test the switch for continuity; if the pressure relief switch does not have sufficient continuity while closed, then replace it with a new one.
Problem With Wall Thermostat
The wall thermostat has backup contacts in case the main contacts fail. To test it, take a multimeter and test continuity on each switch.
If both switches have continuity, but one is popped out slightly further than the other when both are off, then you have a defective thermostat.
Limit Switch For Flame Rollout
The flame rollout switch monitors the heat surrounding your heating system.
If the inducer fan motor cannot draw enough air through your burners and vents, or if there is a venting problem, chances are good that your flame rollout switch will activate to shut down operations before it reaches the point of overheating.
You can use a multimeter to test the switch yourself, and you should look for continuity or else replace it immediately.
If there’s no continuity in the switch, chances are good that you’re experiencing inadequate airflow or ventilation issues.
Make sure your vents are always fully open and clear of any obstructions as much as possible, as this can lead to problems later on down the road.
Motor For Draft Inducers
The draft inducer motor draws air into the heat exchanger and then exhausts it out of the flue. The pressure switch senses a pressure change and closes a switch to signal the control board that the furnace has proper airflow.
If this thing is broken, it may be unable to close the pressure switch, causing the ignition process to stall and your furnace to shut off after a few minutes.
If your furnace’s ignition process isn’t working like it should, and yours breaks down after a few minutes; you might have to go ahead and replace yours with a brand-new inducer motor.
Defective Flame Sensor
If a flame sensor is defective and does not detect flames, it could cause the furnace to shut off.
The reason for this is that if the sensor doesn’t detect any flames, the control board will think that there is no need for heat, so the unit will shut down.
If a flame sensor isn’t working properly, you can clean it with a fine abrasive pad and check to see if it’s detecting flames properly now.
If it still doesn’t work or triggers problems when attempting to turn on or off the furnace, then you should consider replacing it.
The igniter gets very hot, glowing orange to light the gas burner. If it’s faulty or cracks, the furnace will not heat up.
To determine if the igniter is faulty when you suspect it might be removed from underneath and inspect for cracks. If any cracking happens to be present, replace it.
If not, use a multimeter to test if there’s continuity and if the igniter doesn’t have continuity either, replace it with a new one.
Philco Furnace Not Heating