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I need help with my. Dometic Furnace For an RV. Ongoing. I…

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I need help with my

Mechanic's Assistant: What specific product are you working with?

Dometic Furnace For an RV

Mechanic's Assistant: Is this a new or an ongoing problem?

Ongoing

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I have been talking to James R, if that works

Submitted: 3 months ago.Category: RV

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Answered in 35 minutes by:

3/1/2023

RV Mechanic: Robert, RV Mechanic replied 3 months ago

Robert, RV Mechanic

Category: RV

Satisfied Customers: 25,027

Experience: 23 yrs. RV experience including Cummins North West, Country Coach, Monaco Coach - vendor certified.

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Hi! Welcome to JustAnswer. Thank you for contacting us about your RV. I am Robert and will be assisting you today. May I please have your name?

Customer reply replied 3 months ago

Aaron

RV Mechanic: Robert, RV Mechanic replied 3 months ago

Hi Aaron.

So if I understand correctly the flame comes on and then goes out and the only part you replaced is the sail switch?

Thanks, Robert

Customer reply replied 3 months ago

I bought two new sail switches and tried them both. The original sail switch was completely blocked with my dogs hair.

RV Mechanic: Robert, RV Mechanic replied 3 months ago

Please allow me several mins to type a response, I want to cover several items as I am a firm beleiver starting with the simple things, it will take me some time to type a response.

Robert

Customer reply replied 3 months ago

RV Mechanic: Robert, RV Mechanic replied 3 months ago

To start make sure the battery voltage is not dropping below 12 volts DC after the battery comes on, if the voltage drops off the fan can slow down and can affect the sail switch.

We have to assume the propane pressure is good, just becuase the other propane appliances are working does not mean the pressure is correct. Go to the propane tank and shut the supply valve on the tank and then slowly open it up, sometimes if the valve is opened to fast the regulator might lock up and you may not get full line pressure. After opening the valve run a stove burner for several mins and see if the furnace will stay running. In the shop a manometer is used to check pressure.

IF you have good DC voltage and propane pressure and have replaced the sail switch you are down to the high limit, circuit board and electtrode.

The high limit is a disc that sits on the burner and monitors temp, you should have continuity through it if it is good.

The circuit board on the furnace is also suspect, these boards do fail, a good RV shop or mobile RV tech may have a special board tester and can test the board, if the board checks out good then I would replace the electrode next, it sparks the flame but also monitors it and tells the board to shut down.

IF you have more questions or concerns please feel free to contact me, I am around daily and respond when I can.

Robert

Customer reply replied 3 months ago

Thank you.

RV Mechanic: Robert, RV Mechanic replied 3 months ago

No problem at all.

IF you do need more help please let me know, I am around daily and respond when I can.

Have a great night!

Robert

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