surburban furnace will not light
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Dec-05-2013 06:06 AM
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Feb-07-2014 02:01 PM
(Some SF & SH don't have an outside panel just vent/exhaust thru side of rig...they have to be removed from inside)
2 screws hold outside panel in place
1 screw (bottom center) holds furnace in place
Then the whole assembly slides out..provided gas line/wiring disconnected
Here is a write up on SF Series......LINK
Check the ignitor board part number.......replace with one from Dinosaur Boards......LINK
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31
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Feb-07-2014 01:38 PM
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Dec-06-2013 04:09 PM
Ex-Tech wrote:
Well I was going by what the OP stated and that was that he had power TO the sail switch not "through".
Did I misread?
YEP..3rd sentence
"I have 12 volts to relay, temp sensor, sail switch , to circuit board."
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31
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Dec-06-2013 12:10 PM
Did I misread?
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Dec-05-2013 05:10 PM
Ex-Tech wrote:Old-Biscuit wrote:
You have 12V DC power from t-stat to fan thru sail switch, high temp limit switch and to circuit board but no spark/gas valve.
Check for 12V to the gas valve during the opening cycle.....typically 15 seconds after power reaches board. Power is applied to gas valve for 7 seconds while ignitor sparks.
No power to gas valve.....clean circuit board connection
Still no power than circuit board is problem
If you have power to gas valve than ignitor circuit is problem
Bad connection on board for high tension wire....bad high tension wire
Ignitor spark gap/position incorrect (3/16" from back of lance, centered over burner with a 1/8" spark gap)
Suspect you will find no power to gas valve....circuit board.
Suburban part number 520820
Power to the gas valve could also mean bad gas valve.
OP mentions power TO sail switch but is there power going out when the switch is activated?
OP stated he has power at board thru sail switch and limit switch.fan runs.....no spark no gas valve function.
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31
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Dec-05-2013 04:43 PM
Old-Biscuit wrote:
You have 12V DC power from t-stat to fan thru sail switch, high temp limit switch and to circuit board but no spark/gas valve.
Check for 12V to the gas valve during the opening cycle.....typically 15 seconds after power reaches board. Power is applied to gas valve for 7 seconds while ignitor sparks.
No power to gas valve.....clean circuit board connection
Still no power than circuit board is problem
If you have power to gas valve than ignitor circuit is problem
Bad connection on board for high tension wire....bad high tension wire
Ignitor spark gap/position incorrect (3/16" from back of lance, centered over burner with a 1/8" spark gap)
Suspect you will find no power to gas valve....circuit board.
Suburban part number 520820
Power to the gas valve could also mean bad gas valve.
OP mentions power TO sail switch but is there power going out when the switch is activated?
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Dec-05-2013 04:04 PM
Brown wire from board goes to gas valve....12V DC(+)
Yellow is common ground 12V DC(-)
Red wire is 12V DC(+) from battery for fan motor and from limit switch (t-stat to sail switch to limit switch)
The heavy gauge wire (Orange...may look red if faded) is the high tension wire going to spark electrode. Sends high voltage from board to spark electrode and then is used for milivolt signal back to board to prove main flame.
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31
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Dec-05-2013 12:04 PM
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Dec-05-2013 09:55 AM
Check for 12V to the gas valve during the opening cycle.....typically 15 seconds after power reaches board. Power is applied to gas valve for 7 seconds while ignitor sparks.
No power to gas valve.....clean circuit board connection
Still no power than circuit board is problem
If you have power to gas valve than ignitor circuit is problem
Bad connection on board for high tension wire....bad high tension wire
Ignitor spark gap/position incorrect (3/16" from back of lance, centered over burner with a 1/8" spark gap)
Suspect you will find no power to gas valve....circuit board.
Suburban part number 520820
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31
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Dec-05-2013 09:02 AM
2005 Cedar Creek 30RLBS
Pullrite Superglide 16K
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Dec-05-2013 06:20 AM