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07-23-2014, 12:00 PM
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#1
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Senior Member
Vintage RV Owners Club Workhorse Chassis Owner Heartland RV Club
Join Date: Dec 2012
Location: Fairhope, AL / Reedley, CA
Posts: 483
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DSI Test
How can I check the DSI board on my Atwood heater
__________________
Good Sam Charter Lifetime Member 269454, FMCA 239141
2019 Heartland Mallard IDM33 Bumper Pull
1988 Mallard 27SB Motorhome P30 454/TH475/Banks Power
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07-23-2014, 12:05 PM
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#2
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Senior Member
Join Date: Feb 2012
Posts: 1,138
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This might move you towards a better understanding.... http://www.rvforum.net/miscfiles/Furnace_Trouble-2.pdf
I make a troubleshooters guess....I look at incoming power and if I am getting any spark potential produced to make my decision on the board as being an issue.
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Craig Gosselin
1994 Fleetwood 33H
1995 Fleetwood 30H (parts vehicle)
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07-23-2014, 01:40 PM
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#3
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Senior Member
Vintage RV Owners Club Workhorse Chassis Owner Heartland RV Club
Join Date: Dec 2012
Location: Fairhope, AL / Reedley, CA
Posts: 483
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Ok thanks, I'll check it out when I get home
__________________
Good Sam Charter Lifetime Member 269454, FMCA 239141
2019 Heartland Mallard IDM33 Bumper Pull
1988 Mallard 27SB Motorhome P30 454/TH475/Banks Power
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07-23-2014, 01:45 PM
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#4
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Senior Member
Vintage RV Owners Club Workhorse Chassis Owner Heartland RV Club
Join Date: Dec 2012
Location: Fairhope, AL / Reedley, CA
Posts: 483
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I'm not even getting the spark "tick" like on the MH heater, just the fan turns on.
I also don't think the gas valves are opening. I'll break out the multi meter and post back see where we can go
__________________
Good Sam Charter Lifetime Member 269454, FMCA 239141
2019 Heartland Mallard IDM33 Bumper Pull
1988 Mallard 27SB Motorhome P30 454/TH475/Banks Power
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07-23-2014, 02:12 PM
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#5
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Senior Member
Join Date: Feb 2012
Posts: 1,138
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You are on the right track...check in coming power with your meter to the board.... make sure the hot water switch is in the ON position. Make sure your water is ON to the hotwater heater (not in bypass)....then make your measurements. Remove the connectors and replace them to the board and to the spark igniter.....this might be a simple bad contact issue.
__________________
Craig Gosselin
1994 Fleetwood 33H
1995 Fleetwood 30H (parts vehicle)
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07-23-2014, 05:26 PM
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#6
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Senior Member
Vintage RV Owners Club Workhorse Chassis Owner Heartland RV Club
Join Date: Dec 2012
Location: Fairhope, AL / Reedley, CA
Posts: 483
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It's on the furnace, should of said that not heater
__________________
Good Sam Charter Lifetime Member 269454, FMCA 239141
2019 Heartland Mallard IDM33 Bumper Pull
1988 Mallard 27SB Motorhome P30 454/TH475/Banks Power
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07-23-2014, 06:34 PM
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#7
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Senior Member
Join Date: Sep 2012
Posts: 4,232
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Uh, yea furnace is not the WH.
What model is this?
There is a certain order of things.
Furnace gets call for heat. Board turns on blower.
Sail switch closes circuit, telling board that there is proper air flow from the fan.
Once sail switch closes, board concurrently starts sparking ignitor and opening gas valve.
As long as heat is sensed from thermocouple, ignitor stops, gas valve stays open until t-stat stops calling for heat.
If you have no ignitor sparking or gas valve opening, go to sail switch.
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07-23-2014, 10:34 PM
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#8
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Senior Member
Vintage RV Owners Club Workhorse Chassis Owner Heartland RV Club
Join Date: Dec 2012
Location: Fairhope, AL / Reedley, CA
Posts: 483
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Sail switch was not sailing  
It was jammed up, freed it and it works great. On the down side it was a PITA!!!!! Had very little room to get to it, got a few battle scars, but its fixed and for FREE 
Thanks for the help.
__________________
Good Sam Charter Lifetime Member 269454, FMCA 239141
2019 Heartland Mallard IDM33 Bumper Pull
1988 Mallard 27SB Motorhome P30 454/TH475/Banks Power
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07-24-2014, 08:15 AM
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#9
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Senior Member
Join Date: Feb 2012
Posts: 1,138
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Furnace is not too much different and I have some nice videos of that too but you do have to pull most furnaces out or partially out of the MH to work on them. I can certainly see where you might get cut and nicked if you tried to reach over and around all the stuff to work on it while stuff tightly in there.
__________________
Craig Gosselin
1994 Fleetwood 33H
1995 Fleetwood 30H (parts vehicle)
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Linear Mode
