Dometic Furnace fan outside is 11.6 volts

[Luluray69]

My thermostat power is 12.6 volts outside at furnace is 11.6 so heat won't kick on why is there not more power at motor

[RPR]

Info on voltage. If picture is fuse tap on it one time.

[JimD]

Here is a posting I made regarding a low voltage problem I had with my fridge. Maybe yours is similar.


I had a similar problem with my 2017 Greyhawk and a Norcold 1210. Boondock camping overnight would cause the fridge to display low DC voltage in the morning. This happened just about every night,

I have a remote voltage monitor on my battery and found that the fridge would go into this error mode when my battery voltage dropped to 12.1 volts at the battery. According to the Norcold manual, low DC shouldn't display until the voltage was below 10.5 volts.

I assumed that I had a bad fridge control board but, being an electronic tech, decided to troubleshoot on my own. With the fridge on (propane mode), I measured the voltage at the battery and then at the main power distribution box and the measurements were basically the same with little voltage drop. I then measured it at the fridge.

I was floored because I was measuring a bit over a 1 volt drop between the power distribution box and the fridge. I believe the fridge was pulling 2 amps or less at the time while operating on propane. The wire run had to be less than 20 feet so this was indeed strange as according to the Jayco wiring diagram they were using 16 gauge wire which should easily handle a couple of amps.

I ended up piggy backing a new 16 gauge wire from the box fuse connection, for the fridge, to the fridge and also one for the ground to the frame. My new voltage measurements showed no voltage drop now and my error condition has not returned for over a year.

From the looks of Jayco's wiring, they were using Scotchlock connections all over the place to make various connections. My guess is that the wiring to the fridge was not a direct wire but may had been run through a poor connection somewhere in the run.

So, if you are getting a low voltage error, measure the voltage at the battery and then at the fridge to see if the voltage feeding the fridge is low. If it is good then the problem is with the fridge. If the reading shows low, well, good luck at explaining it to Jayco.

[pconroy]

Originally Posted by Luluray69

My thermostat power is 12.6 volts outside at furnace is 11.6 so heat won't kick on why is there not more power at motor

In addition to the other's suggestions - is this a new thing? Has the furnace every worked?

[Luluray69]

Yes worked awesome last year and for the last 3 years just know quit giving proper voltage everything else works great just not heater voltage

[OnTheGo]

Originally Posted by Luluray69

Yes worked awesome last year and for the last 3 years just know quit giving proper voltage everything else works great just not heater voltage

I think that makes JimD's solution your best bet (as it usually is).

When you make that type of repair it's easier to run the wire anywhere it's convenient, even in the open, until you know it works. Then hide the wire(s) and make final connections.

[TowPro]

How old is your battery? when you check the voltage and see 12.6v I bet the fan is not running, but than when you try to turn on fan the load drops the battery voltage to 11.6v? to me a lead acid battery that HAS BEEN PROPERLY CARED FOR is only good for 5 years. one that has been run dead (below 12.2v) several times may have a life as short as less than 2 years.