NHTSA ID Number: 10136800
Manufacturer Communication Number: 30012
TSB/Document Date: 2018-05-14
Summary
This is NOT a safety related defect or noncompliance. This document advises the OE's, Dealers, and Customers of a nuisance issue which will blow the protective fuse in the furnace or leave the furnace inoperative in a safe shut down state, in the event that the upper limit wires short against the exhaust vent tube, on furnace models with serial numbers between 73985322 and 81099541.
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TSB/Document ID: 30012
Replacement Service Bulletin Number:
MFR Communication Date: 2018-04-25
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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HEATING
FURNACES
EN
Furnace Limit Switch
Service Bulletin
USA & Canada
Service Office
Dometic Corporation
1120 North Main Street
Elkhart, IN 46514
Service Center & Dealer Locations
Visit:
www.dometic.com
Read these instructions carefully.
Model
Serial Number Range
All Small & Medium Furnaces (AFS, AFM, DFS, DFM)
73985322 – 81099541
We have been able to identify a non-safety related nuisance issue that is occurring on our Dometic/Atwood furnaces.
This nuisance issue has the potential to occur on all models of Dometic/Atwood Furnace with serial numbers between
73985322 and 81099541. The nuisance issue enunciates by either blowing the protective fuse, opening the circuit
breaker in the furnace circuit, or rendering the furnace inoperative. Our testing has shown that in ALL instances the
furnace fails in a safe manner.
The cause of this nuisance issue is a mistaken omission of a plastic wire tie to suspend the heat exchanger limit switch
wires up and away from the exhaust tube vent terminal. The omission of this component allows the limit switch wires to
potentially melt on the vent terminal, shorting to ground, and causing either the fuse or circuit breaker in the circuit to
blow, or the sail switch to become inoperative. In ALL cases the safety devices in the system are performing as
designed and prevent the furnace from operating.
Dometic recognizes this nuisance tripping issue is an inconvenience to our OE and potential end-use customers and
we apologize for the extra work that may result. In an effort to try and reduce the amount of work required to correct this
mistake we have designed and tested a field repair for this occurrence, which will be more expensive for Dometic but
will make the field repair much easier.
After removing the vent assembly, look into the exhaust vent tube area. If visual evidence exists that the limit switch wires
are melted or laying on the exhaust vent tube, contact the Dometic Technical Service department at 866-869-3118 to
obtain authorization for removal of the furnace for replacement, prior to repairing any wires or continuing with a field repair.
The field repair involves sliding a 7” long, high-temperature rated, fiberglass sleeve over the exhaust tube. The field repair
kit became available in March, 2018. The field repair kit part # is 31389, Flat Rate Time is .5 and the fault code is 617.25.
1
1.1
SLEEVING THE EXHAUST TUBE
Examining the limit switch wires
1
1.2
Installing the fiberglass sleeve
2
7" Fiberglass
Sleeve
Limit Switch
Vent Assembly
Exhaust Tube
Form No. 30012_C 04/18 | ©2018 Dometic Corporation
Vent Assembly
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