Heater Fixed in Scamp - Fiberglass RV


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Old 08-25-2010, 01:51 PM   #1
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Heater Fixed in Scamp

It's starting to get cooler at night & we are planning on a trip to Duluth in October for our 1st anniversary & to look at the autumn leaves so I needed to fix the heater. When I turned up the thermostat the fan came on but there was no click sound for the igniter.

I talked with Floyd last weekend & he helped me narrow it down to a few things. I pulled heater out & saw that the wing metal flap broke off the switch. The fan would blow air onto the winged metal piece & make the igniter come on. I tried soldering the metal piece back on but it wouldn't stick so I just ordered a new one for $15. The new switch should be here tomorrow so I should have heat.
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Old 08-25-2010, 03:12 PM   #2
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The ice probably just melted off the lake up there this month.
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Old 08-26-2010, 10:48 PM   #3
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I put the new switch in & it still isn't getting heat. I hear no clicking for when it's trying to ignite. Is the board the next thing I should replace? I hope not... it's over $130.
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Old 08-27-2010, 03:06 PM   #4
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Heater Fixed in Scamp

Now that you know the sail switch is back in position, you should make sure that the switch part is actually making or breaking the circuit. With no power to the furnace, put an ohm-meter across the switch contacts and manually trigger the switch. It should go from open to short (Zero Ohms), or vice versa.
Next is to re-connect all the push-on connectors. Notoriously known to corrode and/or make bad connections. Pull each one off with pliers, then push back on, checking the wires for good looking crimps (or solder).
Then with power on, make sure that there are voltages actually getting to the circuit board.
After that, You are on your own. The high voltage igniter circuits are sensitive to moisture and short circuits to ground. The sparker tip is sensitive to positioning, but if you are not hearing it trying to start then that's where you have to start. Thermostats go bad - short across the terminals and see if that works, bypassing it. If it starts but doesn't stay lit, or goes out, the low voltage millivolt circuits are very intolerant of bad connections or open grounds. And the thermocouple has to be in the hot part of the pilot light, if you have one of those.
In my case my fridge required a new board and I was able to get a replacement made by Dinosaur for it, with improved capabilities. It was just over $100 - they probably also make ones for furnaces.
A lot of what I am advising are just general troubleshooting tips, not specific to your furnace, BUT a systematic trial and error and process of elimination can often solve these pesky problems.
Good luck.
Mike
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Old 08-31-2010, 03:46 PM   #5
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Thanks Mike, I sent you a PM...
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Old 08-31-2010, 03:57 PM   #6
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I can't offer much more in troubleshooting than I did, but see:
<http://www.ducktec.com/furnace-trouble-shooting.html>
for further hints.
They don't offer as much actual fixing advise, as replacement advise, so it could be costly.
I hope you have success - go slow, go methodical, step by step.
Mike .....>



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Thanks Mike, I sent you a PM...
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