When I turn on manual "FAN ON", the fan does not turn on. I hear a "click" at the furnace when the manual fan is trying to turn it on, but the blower motor does not turn on.
I checked voltage between R and C on the main board and it shows 27VAC.
However, when the heat turns on, the fan turns on just fine to circulate the heat throughout the house.
The manual "FAN ON" was working fine up until a few days ago.
Furnace model: YORK TG9S100C20MP11A
Thermostat: Google Nest Learning Thermostat Generation 3
I did a factory reset on the Google Nest Thermostat and still having the same issue with the fan.
Your furnace uses two blower speeds. One for heating and one for cooling.
I don't know which speed the FAN ON controls. Usually it's the high (cooling) speed.
Go to your furnace board and jumper from R to G and see if the blower runs. Be sure to hold the safety switch in when doing this test or the furnace will be dead.
If it does.... you can try the same thing as the stat. Connect the G wire to R and see if the blower runs.
I jumpered R to G on the furnace board and heard the same "click", but the blower motor still does not run. I didn't try jumpering the wires at the thermostat because based on the result above, it seems the problem is not with the thermostat.
From the wiring diagram, it looks like the high speed is for cooling.
Side note, there are no fault codes blinking on the LED on the control board.
HI COOL to Neutral does not show 120V when the blower should be running. I hear the "click" and the multimeter goes from around 120mV to 330mV....but not 120V.
[color=#222222]1. In which area you live and ambient temperatures you usually experience.
- Pacific Northwest United States. Temperatures are just above freezing overnight, mid 40s during the day currently.[/color]
[color=#222222]2. House style and construction details.
- Rambler ~2400 sqft[/color]
[color=#222222]3. Make, model and age of equipment related to the problem.[/color]
- Thermopride OC5 furnace with a Thermopride A,AF burner
[color=#222222]4. Fuel type.
- #2 diesel oil[/color]
[color=#222222]5. Water temperature and pressures of boiler systems.
-N/A[/color]
[color=#222222]6. What type of zoning do you have with your boiler system.
-N/A[/color]
[color=#222222]7. Thermostat type.
- Honeywell RTH8500[/color]
[color=#222222]8. Anything else that would be useful. No detail is to small. The more information you provide the easier it becomes for the professionals in this forum to determined the cause and correction to the problem.[/color]
I'm experiencing quite a lot of air in the supply line between heating cycles, so much so that the pump expels nothing but air or sputters out of the nozzle for the duration of the Protectorelay 45 second inspection period. During this time I audibly hear the lack of ignition. After the lockout period and resetting the furnace will fire and run without issue. During the run I can hear the audible ignition occuring.
I have verified the air expulsion from the nozzle by inserting the gun assembly into a bucket during the initial ignition cycle. I've replaced the pump with a new A2VA-7116 Suntec pump, changed oil filter, checked all fittings for snug, verified transformer function with the screwdriver test, replaced the nozzle with a 0.75-80A.
The tank is buried outside in front of the house, the line runs are approximately 30 feet long or so, mostly underground. The house was built in the early 70s and I might only speculate that the tank is that old as well.
I have between 18-20 inches of oil in the tank currently. I've used compressed air to attempt to back-pressurize the line into the tank to clear any debris. At this point I don't think the issue is cold oil or ambient air and I suspect I have a leak somewhere in the intake line that is allow the oil to leak out and air to enter the intake line.
Is there anything else that I might be missing?
Goodman Furnace Model# GMEC960603BNAB
Furnace is about two years old. We moved into our new home built in 2018 this fall and this is our first winter. We've been having problems with the furnace operation as it seems to cycle on and off every 5 mins or so and could take a while for our rooms to get heated up.
In preparation for the winter, we had a HVAC company come in to do a PM a few months back to ensure it was in good shape. The following was done:
*blew out condensate and pressure tubes. Ok
*checked all the wiring for loose connections. Ok
*checked the squirrel cage and motor to ensure fan isn’t coming loose or breaking
*condensate pump ran
*checked the flame sensor and ignitor. Ok
*cleaned out the burner tray
*checked the burner tubes. Ok
I also have been changing the filter out every month as we have some cats. All the registers are open and unrestricted. When we do get heat it comes out with good airflow.
When we adjust the thermostat, the furnace will kick on, we will hear the fan, a steady green light will remain on. Then I can see the heating element glow and the burners start, the light will blink amber indicating the burners are firing. After 5 minutes, the burners shut off and I can see the light blink 4 times red. The manual shows this is "Open high limit". I can see the limit switch in the center under the burner, is it defective? Is there another way I can troubleshoot this? Kind of losing my mind as i'm worried that this cycling is harming the system in the long run...
01-24-21, 10:29 AM
