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I have 2008 Montana with a Dometic heat unit. It has a two…

I have 2008 Montana...

I have 2008 Montana with a Dometic heat unit. It has a two button thermostat. The lights are on on the wall thermostat and the remote temp will adjust up and down but the heat will not come on.

Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about?

The green unit on light and the red furnace light

Mechanic's Assistant: Are you fixing your Montana yourself? What have you tried so far?

Yes. I pulled the batteries out of the remote and ran the temp up to 88. It is my brother-in-law's trailer and he said that usually makes it come on

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

The unit doesn't beep when you adjust the temp. It will usually beep when the temp is adjusted

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Answered in 2 hours by:
11/11/2018
RV Mechanic: Randall, RVIA Certification replied 4 years ago
Randall
Randall, RVIA Certification
Category: RV
Satisfied Customers: 28,750
Experience: RVDA/RVIA Master Certified Technician with many years experience.
Verified

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.

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Customer reply replied 4 years ago
Ok. Let me know what you need
RV Mechanic: Randall, RVIA Certification replied 4 years ago

This is a remote controlled unit? Those are NLA and if the receiver is bad he may need to upgrade to a newer system. You can try unplugging the cable on each end and see if that brings back the power and signal. It looks like a phone cable. One on the receiver and one at the control box under the A/C and visible when you remove the air filter and housing on most models. Let me know what happens.

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Customer reply replied 4 years ago
The lights went out on the receiver. After plugging each back in the unit doesn't respond. I can adjust the remote but no lights come on at the receiver.Can the receiver replaced with a regular thermostat to get rid of the remote?
RV Mechanic: Randall, RVIA Certification replied 4 years ago

It might be a blown fuse in the load center for the furnace OR some control modules have 3 amp fuse on them. Yes, you can replace this with a new digital thermostat. Takes some wiring and about $100 in parts. I can direct you in that hookup.

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Customer reply replied 4 years ago
That would be great. I haven't found a blown fuse.
RV Mechanic: Randall, RVIA Certification replied 4 years ago

Did you take the cover off the control module and check in there?

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Customer reply replied 4 years ago
No. Where is the control module at? I only looked in the load center.
RV Mechanic: Randall, RVIA Certification replied 4 years ago

Depending on the model of the A/C it may be underneath the air filter when there is a direct vent under the unit OR up on top and visible when the cover is removed off the A/C.

If you can give me the model number of this unit I can tell you which thermostat kit you would need.

I need to take a short break here to go turn on my power system. I live off-grid.

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Customer reply replied 4 years ago
Ok. I will send you some info.Duo-Therm(###) ###-####004
S/N CO 107168
RV Mechanic: Randall, RVIA Certification replied 4 years ago

That may be the part number off the control. The A/C model usually starts with a 5 or a 6. Like 59615 or 600315.

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Customer reply replied 4 years ago
No fuse in control module.
RV Mechanic: Randall, RVIA Certification replied 4 years ago

If you have or can come up with a small digital multimeter like you can find at most hardware stores for about $20 or so we can do some testing to see if the module is getting power or not. Or it may not have a good ground.

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Customer reply replied 4 years ago
I can. It will be more morning. I am on the east coast. Can I send a message back when I check it in the .morning?
RV Mechanic: Randall, RVIA Certification replied 4 years ago

Yes. I am in California, but get up early.

Randall
Randall, RVIA Certification
Category: RV
Satisfied Customers: 28,750
Experience: RVDA/RVIA Master Certified Technician with many years experience.
Verified
Randall and 87 other RV Specialists are ready to help you
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RV Mechanic: Randall, RVIA Certification replied 4 years ago
Phone call session started
Customer reply replied 4 years ago
What was the part number and brand you gave me? I looked up***********and didn't find anything.
RV Mechanic: Randall, RVIA Certification replied 4 years ago

Dometic part(###) ###-####000 or(###) ###-####010 should be a Capacitive Touch Thermostat kit.

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Customer reply replied 4 years ago
The part is supposed to arrive today. I probably won’t have time to install it until Thursday. I will let you know when I am installing it.
RV Mechanic: Randall, RVIA Certification replied 4 years ago

10-4

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