How do you diagnose a bad furnace ignitor?
Here are a few indications that you have a faulty ignitor.
- No Cold Air.
- The Furnace Won’t Come On.
- The Furnace Suddenly Stops Blowing.
- Starts, Then Stops, Then Starts Again.
- Tripping the Breaker More Than Once.
- I Hear the Click, But Nothing Happens.
- Flame Sensor Problems.
- Short Circuit.
Why does my furnace limit switch keep tripping?
If the air inside your furnace gets too hot, the limit switch trips to prevent overheating. If the furnace high limit switch trips due to overheating, there is likely an airflow issue that is preventing proper air movement through the system. Check your air filter, and replace it if dirty.
How do I know if my furnace is short cycling?
If your furnace turns on and off repeatedly for short bursts of time, not allowing the house to reach its proper temperature, it is short-cycling.
What does intermittent ignition mean?
An intermittent pilot system uses an electronically controlled high-voltage electric spark to ignite a pilot light—and subsequently the main burners—when the thermostat calls for heat.
Why does my furnace say ignition failure?
Due to safety reasons, if a furnace’s air filter has become clogged, the furnace will no longer ignite. So, if your furnace is failing to ignite, it’s a good idea to check the air filter. If it looks clogged up, then this is probably the source of the problem.
How does an intermittent pilot ignition work?
Intermittent Pilot Ignition is an electronic system, which uses an electrode to ignite the pilot gas. In turn, the pilot flame lights the main burner gas. The term Intermittent is used because the pilot burner flame is only present when the main burner is operating. When the main burner is off the pilot is also off.
Can thermostat cause short cycling?
Your thermostat could also cause the HVAC system to cycle on and off rapidly, a process known as short cycling. Your furnace or central air conditioner spends a good amount of energy simply turning on and off, which is why you want yours to run for at least 15 minutes at a time before shutting off.