Need Help Locating Heating Fuse/Breaker

[rvdave65]

Could use some help locating the fuse/breaker for the "system heat" switch on a 2002 Monaco Windsor.

I'm a new member, fairly new RVer, and pretty confused as to how to navigate this website.

Dave

[DBOL]

Quote:

Originally Posted by rvdave65 Could use some help locating the fuse/breaker for the "system heat" switch on a 2002 Monaco Windsor. I'm a new member, fairly new RVer, and pretty confused as to how to navigate this website. Dave

Dave P ost new tread and just say need heating help Monaco in Sa Antonio you will have better responce

[RustyJC]

Dave,

I've retitled your thread - it should generate more useful views and responses with a title that reflects the subject.

Rusty

[DBOL]

Start watching Dave ,Rusty has you on right track,I'm fairly new and this site is really helpful and can save you $

[MonacoMama]

Hi there again!
You will find the Monaco Forum will tend to be your best resource for Monaco specific information. The members here are pretty awesome and always willing to share information!

As for your answer...I can tell you that on our 2007 Diplomat where you will locate the fuse for the "snap disc" which will make the heat system come on. It is the F70 fuse in the front run bay. This happens to be a 5 amp fuse for our system. I cannot promise you that yours will be located in the same slot...but I would suggest checking there first and then any 5 amp fuses in the front run bay.

We are happy to have you here..you have found a great forum with some very friendly members!

[bullydogs1]

I'd call Monaco tech assistance at 877 466 6226..they can tell you. .On my unit the system heat fuse is in a separate 12 v box inside the battery compartment and is clearly marked...there is also a fuse inside the heater itself but it won't come on until the temp in the compartment is less than 35 degrees or so (snap disk as they call it turns it on)...they've been known to fail...if you are getting a light when you turn on the switch but not activating the heater..then it's the snap disc...if you are not getting a light at all--it's the fuse and I bet it is with the bedroom slide fuses in the battery compartment where mine is.

[Diplomat Don]

rvdave65......This question comes up every so often. The first question I ask is how do you know the heater is not working. Here is how it is designed to work:


System Operation:
1. Systems heat switch is turned ON applying power to the snap disc thermostat and bay heater.
2. When the bay temperature reaches 40 degrees F +/-6 degrees the snap thermostat will close applying power to the bay heater and the systems heat active indicator light will be lit. The twelve-volt heater will continue to operate until the bay temperature reaches 55 degrees F +/-6 degrees F. The indicator light will then turn off.

If your switch light is turning on, the indicator light will not come on until the temperature in the bay gets low enough. A lot of people test it by locating the small snap disc (attached to the heater wiring harness) and hold an ice cube against it. If it still doesn't work you'll have to search further for the problem.

The first check I would make is to turn the system switch on and see if you have power (12 volts) before the snap disc. If you do, then the snap disc probably went bad. If you don't, you'll have to start back from there looking for power.

[rvdave65]

Wow, thanks for all those responses. I've read them all. Here's where I'm at now:

While waiting to see if your website would turn up any responses, I also emailed Monaco, and a Senior Technical Advisor named Bob Presson helped me locate the fuse for the system heat switch. Part of my problem was I was looking right at it, and didn't even know what I was looking at. Turns out it's a cube (1" x 1/2" x 1/2" approx) with two screw posts sticking out of it, and it was mounted on the back side of a buss bar. That was all new to me. It was located in the rearmost electrical compartment on the passenger side of the coach. This was a 5 amp fuse, and right next to it was a 30 amp fuse for the system heat. I removed them, and put a fuse tester on them, and they both checked out ok. So, I put them back. Now I know where the fuses are located, and that they are not the problem. Looks like everybody's coach has them in a different place, and that there not all the same type of fuse.

However, I'm still not out of the woods. What got me looking for the fuse was the fact that neither the system heat switch nor the system heat indicator would illuminate when the system heat switch was turned on.

This problem occurred when I reconnected the red wire to the bay heater. It had broken off, or burned off, and as a consequence only the fan would work. No heat came out. Up to this point the system heat switch and system heat indicator still illuminated. However, after reconnecting the red wire, the heater put out heat for a short time, but then it quit, and that's when I noticed the system heat switch and system heat indicator were no longer illuminated. That's when I suspected I had blown a fuse, and thus went searching for it.

I should add that I have a "cold package" on this rig, which consists of heating pads on the underside of the holding tanks, and these pads are also controlled by this system heat switch. So, even though I've decided, based on remarks I've seen, not to use the bay heater anymore, I still want to use these heat pads, and since the switch and indicator don't light up anymore, I'm not sure if there getting any power.

I have removed the bay heater, and tested the wires coming from the coach. Here's what I did:

I put a voltage meter on the wires on the coach side. There are three wires, a red hot wire, a black ground wire, and a pair of blue wires that supposedly come from the switch in the cabinet above the passenger seat. I'm not sure why there are two blue wires, since the wiring diagram for the heater only shows one coming from the switch.

Anyway, I put the meter on the red and black wires and got 13.2 volts, whether the switch was on or off, as expected, so there is power down those wires. Then I put the meter on the blue(switched) wire and the black wire, and got no voltage, either with the switch on or off. Which leads me to believe there is another fuse on the line to the switch. If so, where would it be? Behind the switch panel?

Any suggestions?

Thanks for taking the time to read this,

Dave

[Rex]

Dave the blue wires should ONLY have power when the snap disc is closed, and then only if you have the wires disconnected and are testing them. The snap disc is in series with the System Switch. Both the System switch and the snap disc must be closed for power to be supplied to the pads or the bay heater. There is also a pad relay somewhere but I have no idea where it is. It will not cause the bay heater not to work.

The snap disc is about the size of a dime and will have two wire terminals. It may well be behind the plastic panel in your storage bay where all the controls are located. One of the blue wires should go to it. Once you find it, turn the system switch on, then short across the two terminals and the heater should come on. You can also place an ice cube on the snap disc to cool it down and and if that turns the heater on then the disc is working correctly.

The snap disc must cool to about 30-35 degrees before it closes and turns the heater on. When the compartment warms sufficiently the disc will open and turn the heater off.

Without the snap disc closing, the cold package will not turn on.

[Diplomat Don]

Dave....I just happened to read a post on another website. They were discussing the fuse location for the bay heater. Their's was located in the battery bay. In my coach and apparently theirs, there is a large black box against the back wall. They found a fuse for the bay heater there. This box should have the electrical for your slideouts.

[rvdave65]

Again, Rex and Don & Mary, thanks for the feedback.

At this point I have located the system heat switch fuse, and the snap disk as well. The fuse was good, and I replaced the snap disk just for the heck of it.

The wires to the bay heater have current, and the wires to the snap disk have current. However, the system heat switch does not illuminate when I flip it on, and the system heat indicator light never comes on either. Now get this, when I touch the two leads to the snap disk together, both of those light up.

At this point, being an electrical hack, I'm confused and fed up with it, and am ready to let a technician take over. What's supposed to work, ain't working.

I ended up putting a 100w bulb in the basement, keeping the propane furnace on, and staying disconnected from city water, and we've managed to survive two nights in Austin with temps well below freezing. It was 19 degrees last night. So, there seems to be no urgency to fix the system heat problem.

Once again, I thank you for your input, but today I'm going to tour Austin.

Ya'll stay warm.

Dave

[sundancekid]

Dave, if you short the two leads of the snapdisc together and the indicator lights come on, then that snap disc is bad or the temp setting for that disc is incorrect (too low).

Denny

[Happycarz]

Dave,
A little more background information for you. My bay heater has three wires going to it. A red wire connected to an fused nonswitched power source, a yellow wire from the snap disk and a black ground wire. Thus, the cube heater has a constant 12v supply (red) and ground (black.). The signal coming from the snap disk (yellow wire) switches on the relay in the heater to apply the 12v (red wire) to the blower and heating element.
The wall switch for the system heat is on another fuse and powers the snap disk. If you look at the snap disk, you will see two wires coming out (at least in mine) with one going to the heater as the signal wire and the other back to panel light, marked "System Heat" to turn it on. So you need to have 12v on both wires at the bay heater to have it come on. As far as the tank pads, I am assuming the "System Heat" switch turns on a separate relay to send power to the pads. This may or may not also run through the snap disk. How many wires are attached to the snap disk?

[Dr4Film]

Right after I purchased my 2002 Windsor from the original owners, I noticed that the bay heater had been disconnected and was sitting in another bay. After looking at the heater and looking at where it sat and the wires, I decided that I really didn't want that POJ sitting in a possible wet area were I could already see rust stains on the bottom shelf area of the bay where the heater had sat. So I threw the thing away and when it is cold enough to warrant some freeze protection, I have a 100 watt drop light that works great. The system switch is in my top left curbside panel control where the inverter switch control is and the level monitors are located. When I turn that switch on, the red light only gets illuminated when the temperature drops to a level and the heat for the tanks pads turn on.

Can't help with anything else other than a little bit of information.

Good luck!

Dr4Film ----- Richard.