Atwood 8940 motor: andyux33: Class A Motorhome Discussions: 6: 10:43 PM: Atwood 8940 III DCLP won't stay lit: Deniseg: RV Systems & Appliances: 4: 05:11 AM: Wiring connections on Atwood 8940 III control board: drive805: RV Systems & Appliances: 2: 12:25 AM: Furnace fan runs, but will not light: broadrun: Monaco. Technician to install an atwood - hydro flametm furnace. Installer: leave this manual with appliance. Model # 8935 8940 8935 8940 dclp-iii dclp-iii aclc-iii aclc-iii.

2004-11-03 17:10:43 UTC

Hi. I have an Atwood Excalibur 8500 III hydro flame furnace. It comes on
and the burner ignites but it won't stay lit. It 'attempts' to light the
burner several times even though it is actually lit and then it just shuts
down the gas (propane) and the blower continues to run (until we freeze to
death, turn it off, or the battery runs down).
According to Atwood's web site there are many things that can cause this
problem including low gas pressure, bad circuit board, bad flame sensor, too
much static pressure, not enough static pressure, bad wires, loose blower
wheel etc. I found that the blower housing had a missing screw which would
cause low static pressure. I replaced the screw and the furnace worked
fine--for a while. Then it started doing it's thing again.
I have not tested the circuit board, the gas pressure, or the static
pressure as of yet mainly because getting all of the needed equipment to do
this would probably cost as much as a new furnace. I have checked the sail
switch, checked the exhaust for obstructions, checked for loose connections
etc.
I would like to know before I yank the thing out and take it apart if there
is a common problem with these furnaces that can cause this particular
problem. I found an aftermarket circuit board but it costs $150 and it says
that after two failed attempts to light the furnace it shuts down
permanantly. Sound rather final. Also sounds like maybe you need to buy
another $150 board if it shuts down. But at least it doesn't keep the
blower running ;-)
Thanks

LITERATURE NUMBER MPD 31232

hydro flameTM

8900-III-LD Series Furnace

MODELS 8935, 8940

Technical Installation Manual

ENGLISH, FRANCAIS (et Canada)

THIS INSTRUCTION MANUAL IS FOR USE BY AN AUTHORIZED SERVICE TECHNICIAN TO INSTALL AN ATWOOD - hydro flameTM FURNACE.

INSTALLER: LEAVE THIS MANUAL WITH APPLIANCE. CONSUMER: RETAIN THESE MANUAL FOR FURTHER

REFERENCE.

This furnace design has been certified for installation in recreation vehicles as a MSP Category III furnace. Follow this installation instruction to insure safe operation of the furnace. Failure to install furnace according to this installation instruction nullifies the furnace warranty.

SAFETY ALERT SYMBOLS

Safety Symbols alerting you to potential personal safety hazards. Obey all safety messages following these symbols.

WARNING	CAUTION
avoid possible	avoid possible
injury or death	injury and/or property damage

WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

—Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

—WHAT TO DO IF YOU SMELL GAS

•Evacuate all persons from vehicle.

•Shut off gas supply at gas container or source.

•Do not touch any electrical switch, or use any phone or radio in vehicle.

•Do not start vehicle’s engine or electric generator.

•Contact nearest gas supplier or qualified Service Technician for repairs.

•If you cannot reach a gas supplier or qualified Service Technician, contact the nearest fire department.

•Do not turn on gas supply until gas leak(s) has been repaired.

—Installation and service must be performed by a qualified Service Technician, Service Center or gas supplier.

•Installation
Effective 3/08
INDEX
FURNACE SPECIFICATIONS ...............................	1
DIMENSIONS .................................	1
WEIGHT ....................................	1
MINIMUM CLEARANCE TO FLOORBOARDS, WALLS,
& SIMILAR COMBUSTIBLE BUILDING MATERIALS.................	2
SAFETY INFORMATION.................................	1-2
FURNACE INSTALLATION .................................	2
VENT INSTALLATION - HORIZONTAL & VERTICAL ...................	2
WALL CUTOUT HORIZONTAL & VERTICAL .......................	Tube rank jeet 3 pro registration code. 2-3
DUCTING HORIZONTAL & VERTICAL ...........................	3
Flexible Ducting ...................................	3
Hard Ducting ....................................	3
OPTIONAL INSTALLATION - BOTTOM DISCHARGE KIT.................	3
GAS CONNECTION ....................................	3
ELECTRICAL CONNECTIONS .............................	3-4
Conductor Sizing Table ..............................	3
12 volt DC Models .................................	3
120 volt AC Models ...............................	3-4
Thermostat .....................................	4
CONVERTIBLE GAS CONTROL ..............................	4
Valve Conversion ..................................	4
Orifice Replacement ................................	4
SYSTEM CHECK TESTS ..................................	4
PROPANE GAS PRESSURE ...............................	Ralink rt5390 driver for windows 10. 4
STATIC PRESSURE ....................................	5
AC & DC WIRING DIAGRAMS ..............................	5
ILLUSTRATIONS ......................................	6
REPLACEMENT PARTS LIST & DRAWING .......................	7

SPECIFICATIONS

*(W.C. = Water Column)

MODEL #

8935

8940

8935

8940

DCLP-III

ACLC-III

BTU

Atwood 8940 Iii Dclp Troubleshooting