Some other possible causes for your furnace delaying igniting are:
- Too much air mixed with the gas, making it hard to ignite
- Too little gas at the burners caused by low gas supply pressure
- Dirty, restricted or weak pilot light (common with older furnaces)
- Misaligned or dirty burners
Can hear your furnace click on but it does not fire up?
Most likely, your furnace is making a clicking noise and not providing heat because your furnace's spark igniter is trying to ignite your pilot light or burners but is failing to do so. In other words, there's an ignition system malfunction that needs to be fixed. Otherwise, your furnace won't start.
What causes delayed ignition on my furnace?
While moisture and rust are one of the most common causes of delayed ignition in furnaces, dust and lint can also accumulate and cause problems. This can be easily remedied by having your furnace inspected and cleaned by professionals before each heating season.
Why does my heat take so long to turn on?
When a furnace takes longer than usual time to kick on like that, whether it's the first time you've turned it on in the fall or the end of winter, what's happening is that the furnace is trying to ignite, failing, and then trying again.
How long should it take for a furnace to ignite?
A furnace should take around five minutes to start once you've turned on your thermostat. That said, you might end up waiting closer to ten minutes to see your furnace kick on if it's older or has an issue with its pilot light. If this is the case, it may need to be checked out by a professional.
What are some possible causes of burner flashback?
Operating the system with too little fuel or at too high of a velocity causes the flame to blow away; too much fuel or too low velocity can cause the flame to flashback into the premixing hardware.
How long should it take a furnace to raise the temperature?
It's not normal for a furnace to raise the indoor temperature ten degrees in less than fifteen minutes. If the furnace shuts off before satisfying the thermostat, it's short-cycling, which indicates a problem. After the furnace has been running for about fifteen minutes, put your hand on the ductwork above the furnace.
How long should it take for furnace blower to start?
In either instance, the blower motor should start within 30 - 90 seconds after burner ignition. If the fan motor does not start, the furnace will overheat and the high-temperature limit switch should cause the burners to shut-off.
Why does my heater take forever to warm up?
A few things that cause automotive heaters to work less well are low coolant levels in the radiator, a faulty heater valve, or the thermostat is stuck open. Have a certified mechanic replace your thermostat if necessary or diagnose and repair other cooling system issues, such as leaking coolant.
What causes delayed ignition on oil burner?
Water can get into the oil due to condensation, negligent storage practices, loose fillbox lids or damaged gaskets and leaks in underground tanks that allow table water to seep in. Small amounts drawn into the pump and discharged to the nozzle can cause delayed ignition.
How do I reset my electronic ignition furnace?
Resetting The Ignitor You can reset the ignition on your furnace simply. To do this you must cut the power to the furnace first by turning off the circuit that powers it. Once the power is off you can remove the burner door to reveal the ignitor. Turn this to “off” and leave it off for at least 5 minutes.
Why does my gas fireplace take so long to turn on?
Usually the problem is solved by having the fireplace cleaned and serviced, which takes about an hour of time. Look for a competent fireplace repairman to do this job for you. Most gas fireplaces do not have a thermocouple, they have a pilot generator which developed the voltage to turn the main burner on.
What can cause soot accumulation on the heat exchanger?
Soot develops due to accumulations of carbon within the furnace. This is usually the case when the furnace is not clean and completely burning fuel, as the result of a poorly adjusted burner or a cracked heat exchanger.