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Old 10-06-2022, 04:55 PM   #1
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Los Brisas 275 furnace - Excalibur 8500-2 series

So just fixed acouple wires that went to my thermostat in the rv for my furnace after acouple of mice chewed into them and finally my fan kicked on.. So I decided to clean the connections going to the Relay but accidentally put the relay in upside down and when I put the thermostat in the on position it made a spark from the thermostat thats how I knew it was upside down. I put it back right-side up but now the fan won't even kick on. What should I do? Did I fry the board?
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Old 10-06-2022, 08:29 PM   #2
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DC+ TO furnace (RED) comes for a FUSED Source
*DC Fuse Panel....see if it blew

DC+ AT furnace (RED) goes to/thru CB on furnace frame
*See if it tripped---manual reset
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Old 10-07-2022, 11:28 AM   #3
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I checked both. The 15amp fuse in the breaker box is good and I pushed in the reset the CB on the furnace still nothing.
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Old 10-07-2022, 12:51 PM   #4
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Quote:
Originally Posted by Las Brisas View Post
I checked both. The 15amp fuse in the breaker box is good and I pushed in the reset the CB on the furnace still nothing.
Time to break out the voltmeter
Verify you have 12VDC at furnace from the 15A Fuse
Verify you have 12VDC thru the CB at furnace
Verify you have 12VDC at thermostat
Verify you get 12VDC Back FROM thermostat

Above all good/verified
Then Time Delay Relay is culprit


This is for the 1991 RV...correct?
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Old 10-07-2022, 07:24 PM   #5
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Quote:
Originally Posted by Old-Biscuit View Post
Time to break out the voltmeter
Verify you have 12VDC at furnace from the 15A Fuse
Verify you have 12VDC thru the CB at furnace
Verify you have 12VDC at thermostat
Verify you get 12VDC Back FROM thermostat

Above all good/verified
Then Time Delay Relay is culprit


This is for the 1991 RV...correct?
Ok ill do that tomorrow. Thank you and yes it is.
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Old 10-10-2022, 01:16 AM   #6
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Quote:
Originally Posted by Old-Biscuit View Post
Time to break out the voltmeter
Verify you have 12VDC at furnace from the 15A Fuse
Verify you have 12VDC thru the CB at furnace
Verify you have 12VDC at thermostat
Verify you get 12VDC Back FROM thermostat

Above all good/verified
Then Time Delay Relay is culprit


This is for the 1991 RV...correct?
Thank you for the help. There was no voltage from thermostat.
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Old 10-16-2022, 03:16 PM   #7
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Voltage drop at relay

Why do I have a 2v drop from furnace relay. Gas valve will open on 10.5 v but not 10.3v I need to figure out why there is such a large voltage drop coming from relay. 12.5v coming from CB to relay but only getting 10.3v from CB 12v wire.
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Old 10-17-2022, 12:20 AM   #8
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Contacts in relay are probably pitted not making full contact.
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