Randall, your were highly recommended to me by one of your fellow experts. I have an issue with a Suburban SF-35F

Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.

Thank you for asking for me here and Robert and I assist each other. I went back and read his exchanges with you so I have a handle on the problem. Two things stand out here. One is that the batteries need to be load tested to be sure they are viable. And then you need to check the converter to be sure that it is putting out between 13.7 and 14.2 VDC. This is definitely an issue with voltage that is too low. Start there and then get back to me with the results. Randall

No problem. I am here every day.

Not great. So find out why the voltage is so low at the furnace. Probably a bad ground or other bad connection. You need over 12 VDC there.

Or perhaps the motor is failing and has a partial short and is dragging the voltage down.

When did you have the LP working pressure at the tank regulator checked and adjusted last? That is supposed to be done at least once a year. You want it adjusted to 12 Water Column Inches and most shops have a manometer and can do this for you.

The furnace is the most sensitive to LP pressure. About half of the ones I check in the shop are low. If you didn't have a bug screen it might be some critters were in there, but the main thing is the low voltage. It has to be up around 12 VDC when in operation. Check it before the motor comes on and then afterward. It shouldn't drop that much.

The blower comes on right away and goes through a purge cycle.

No. I think the motor is failing. If this is the OEM motor it is nearly 12 years old. Most won't go half that long. The voltage has go to stay over 11 VDC or the other parts of the system won't work. And if you are plugged into shore power that DC voltage should be nearly 14 VDC. It won't run long if you are not adding some kind of charging, especially on just one battery.

Google the motor number and see who has the best deal. Generic motors are fine here. What is your serial number and I can give you a part number.

If the serial numbe then is above 12003642 then the motor number is ***** and is a 3" motor. Below that is part number 232682 and is the earlier 2.5" motor.

You are most welcome!

233102. I was looking at the wrong line. I don't know what they would ohm out.

I think you need to have the batteries load tested. And if you only have one then you need two.

There may be a bad connection in there at some point that is causing the voltage to drop. That can be either in the positive side or on the ground side of the circuit.

You are most welcome! Please let me know what you find. Thanks!