KotzurJ
United states
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Joined: 10/08/2023
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I tested the power supply going into the Furnace, which is a white and black wire similar to the wires supplying the light fixtures and outlets with power. The wires were reading 1.8v So I am guessing that the issue is before the furnace. I do not know where the wires come from thought so that is the new issue. Any ideas?
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dougrainer
Carrolton, Texas
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Joined: 06/11/2007
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KotzurJ wrote:The Furnace is a SF-35f Model number
This particular Model requires you to remove the furnace for troubleshooting and repair. It does NOT have the Outside access door. BUT, Since the Oven is on top, it would be easier to remove the Oven assbly to access the 4 wires at the furnace. You are looking for 2- Blue wires. One of the blue will have 12 volts. Makes no difference which one. Just test BOTH for 12 volts. IF no 12 volts, the furnace 12 volt power fuse or reset switch is tripped. The furnace has a black small On/Off switch in the outside casing. This will usually trip if you shorted the wires when replacing the tstat. The Oven only has 4 or 6 screws holding it in and the LP gas line which you disconnect. Turn the LP OFF at the tank first. Doug
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CA Traveler
The Western States
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IF these are 12V power wires then what is the voltage of each one from a good frame ground? A wire tracer can be very helpful in tracing wires.
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KotzurJ
United states
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I pulled the Furnace out and I am only reading 1.8v on the blue wires. I flipped the switch and attempted to start the system again but it did not start up.
![[image]](https://imgur.com/a/ZMrkahw)
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KotzurJ
United states
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For some reason the images are only opening on my posts if you open them in a new tab. Atleast from my end, I'm not sure if they are showing up for you guys.
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dougrainer
Carrolton, Texas
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There are 4 wires at furnace. The RED should have 12 volts. THAT then feeds 12 volts to one of the Blue wires. Check that red wire and report back. IF the red has 12 volts, jumping the 2 Blue together will start the furnace. Disconnect the Blue's to stop the furnace. You had tested previously. The BLACK going to the RED should have 12 volts. CHECK the 12 volt fuses in the Breaker box where the 120 breakers and the ATC fuses are. 1.8(lower than 12 volts) volts is sometimes the result of a LOOSE 12 volt ATC fuse in the fuse block. Do your ceiling lights operate with normal brightness? Doug
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wnjj
Cornelius, Oregon
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KotzurJ wrote:For some reason the images are only opening on my posts if you open them in a new tab. Atleast from my end, I'm not sure if they are showing up for you guys.
Pictures don't show for me but if I use the link they work fine. It could be my browser.
https://imgur.com/a/ZMrkahw
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wnjj
Cornelius, Oregon
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CA Traveler wrote:IF these are 12V power wires then what is the voltage of each one from a good frame ground? A wire tracer can be very helpful in tracing wires.
Good suggestion.
Use a length of scrap wire to connect to a known good ground like at the fusebox. Then measure with that ground versus the red wire at the furnace. Repeat the process with a known good 12V source versus the black wire to make sure the ground is good. As it is now, either wire could have a poor connection.
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opnspaces
San Diego Ca
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Here's the pictures. It appears imgur doesn't allow public linking so I copied your pictures over to the rv.net photo posting site Link
![[image]](https://i.imgur.com/yP3vZGml.jpg )
![[image]](https://i.imgur.com/m3zZPvb.png) Click For Full-Size Image.
![[image]](https://i.imgur.com/zfGZnQhl.jpg )
Click For Full-Size Image.
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dougrainer
Carrolton, Texas
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bottom furnace picture.
The RED(large gauge) and RED small gauge are connected to the 12 volt positive supply as well as ONE of the BLUE. THAT connection supplies 12 volt positive to the FURNACE and also supplies 12 volts to the wall Tstat. IF NO 12 VOLTS AT ALL, THEN YOUR 12 VOLT SUPPLY FROM THE FUSE CENTER IS THE PROBLEM. Take a voltage reading of ALL the fuses at the fuse holder. ALL should have 12 volts on both sides of fuse. Doug
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![[image]](https://i.imgur.com/yP3vZGm.jpg )
![[image]](https://i.imgur.com/zfGZnQh.jpg )
