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Old 01-21-2019, 07:40 AM   #1
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Furnace/ac clicking noise

We have a 2016Forest River Cherokee 304r. Recently when we use the furnace we hear a clicking noise in the a/c unit. Furance takes approximately 5mins to start putting out heat then the clicking stops. I removed the ac cover and there is a gray box where the wires go and that seems to be where the noise is coming from. Furnace is Suburban gas and ac is Dometic as is the thermostat. Any ideas?
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Old 01-21-2019, 08:14 AM   #2
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What is your fan setting on the thermostat?
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Old 01-21-2019, 08:26 AM   #3
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Old 01-21-2019, 08:33 AM   #4
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We have a 2016Forest River Cherokee 304r. Recently when we use the furnace we hear a clicking noise in the a/c unit. Furance takes approximately 5mins to start putting out heat then the clicking stops. I removed the ac cover and there is a gray box where the wires go and that seems to be where the noise is coming from. Furance is Suburban gas and ac is domestic as is the thermostat. Any ideas?
Furnace clicking starts almost immediately after it starts (ignites). Heat is also almost immediately - a few seconds. If it takes 5 minutes, you have a serious problem!!!! Get repairs asap.

No noise should be coming from the AC units (misspoke?). The gas (furnace) heater IS INDEPENDENT with its own ducts too. AC and ducts are at ceiling level and the gas heater is on the floor level.
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Old 01-21-2019, 08:38 AM   #5
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Thanks I'll have it checked out
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Old 01-21-2019, 08:48 AM   #6
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That sounds like the igniter attempting to start the flame, but failing. It waits a bit and then reattempts. You could have a issue with poor gas flow or a sticking sail switch not opening properly.
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Old 01-21-2019, 08:50 AM   #7
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Thanks I will have it checked out
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Old 01-21-2019, 08:57 AM   #8
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When checking, the ignitor is obviously operating just fine.

If the propane was off, there needs to be time (not 5 minutes) for it to purge the ambient air from the line (no idea why the line does not stay full of propane - possible leaks from lousy FR design) before the propane reaches furnace, stove, refr, water heater, … I wonder how much is lost during traveling/camping when the main valve is on - never turned off until back home - could be days, weeks or months. Aside from danger, $$ going up (hopefully never in smoke).

I usually have to start the refr 2 or 3 times before it will accept running on propane vs electric. Water heater is similar. The Stove and Heater usually sooner, first or second attempt, probably because they are the closest to the propane tank in my RV.
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Old 01-21-2019, 08:58 AM   #9
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Furnace clicking starts almost immediately after it starts (ignites). Heat is also almost immediately - a few seconds. If it takes 5 minutes, you have a serious problem!!!! Get repairs asap.

No noise should be coming from the AC units (misspoke?). The gas (furnace) heater IS INDEPENDENT with its own ducts too. AC and ducts are at ceiling level and the gas heater is on the floor level.
Not always true. Heat pumps are A/C units with heating capabilities. The t-states with these units also control the gas furnaces. If set properly they Furnace will only come on when the outside temp is below about 40 degrees and the heat pump is no longer supplying heat. You are correct in the furnace should not take 5 min to start. Clicking from the A/c unit sounds like a bad contractor. Professional service is recommended. There should be NO clicking at the furnace after it fires up.

Just for clarification, AC = Electric service. A/C = air conditioning..
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Old 01-21-2019, 09:04 AM   #10
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If you have a Dometic thermostat, try resetting the thermostat. I have a 2018 Grey Wolf that was doing the same thing and resetting the thermostat solved the problem.
Good luck, that gets really annoying.
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