- kicks in and blows heat for 30-45 seconds - fan stops for 10-15 seconds - repeats this cycle for 30 to 40 minutes, then the fan and the heating stop - 60 to 90 minutes later, starts all over
When I had my furnace vents professionaly cleaned the other day, I asked the technician what his thoughts were, and he stated that this behaviour is due to a faulty limit switch on the furnace. He quoted a price of $300 plus tax to install a new one.
After researching online and verifying for myself that this was rapid cycling, I went down to the local hardware store and found a new replacement limiter switch for $40, so I purchased it. Installing should be straightforward since the existing switch is exposed and already wired, so I just need to set the start/stop limits on the switch.
How are the off/on temperature settings determined? The default settings on the switch (out-of-box) are: Off: 95 On: 135 Limit 210
I can't refer to the current settings on the existing switch because the tech had moved them around before leaving.
Anyone have any knowledge or advice on this?
Cheers in advance - jay