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10-05-2020, 04:34 PM
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#1
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Junior Member
Brand: Thor Motor Coach
Model: Chateau 22b
State: New York
Posts: 24
THOR #6388
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LPG guage and control panel don't match
I have a 2017 thor Chateau. The control panel in the cabin above the door shows the propane tank is full yet the guage on the tanks shows 5/8 full. Wires to the guage are all intact. How do you trouble shoot this issue and if turns out to be the sending unit on the tank guage, can it be replaced without removing the guage.
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10-05-2020, 10:24 PM
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#2
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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"Full" is not actually full.
I think that you can only fill them to 80% of capacity. The gauge on the tank might be reading what's in the tank relative to what it could theoretically hold, and the panel. Is reading what's in it relative to what you can actually put in it
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10-05-2020, 11:08 PM
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#3
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,379
THOR #7035
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Quote:
Originally Posted by El Pirate
I have a 2017 thor Chateau. The control panel in the cabin above the door shows the propane tank is full yet the guage on the tanks shows 5/8 full. Wires to the guage are all intact. How do you trouble shoot this issue and if turns out to be the sending unit on the tank guage, can it be replaced without removing the guage.
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Rotate the sending unit on the gauge to calibrate it:
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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10-06-2020, 01:18 AM
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#4
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Senior Member
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,164
THOR #12751
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LPG guage and control panel don't match
Quote:
Originally Posted by 16ACE27
Rotate the sending unit on the gauge to calibrate it:
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Say what? I'm seriously confused....
The gauge / sending unit just snaps on to the tank. There is no adjustment that I'm aware as it is reading the float level in the tank. I believe it is magnetic.
The gauge will read out the level based on the float in the tank and then send that signal inside the coach for a digital remote readout.
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10-06-2020, 02:08 AM
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#5
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,379
THOR #7035
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My understanding is that you can rotate it to change the reading in the coach.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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10-06-2020, 09:13 AM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,164
THOR #12751
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I had to research that one.......
On my tank it could be installed in one of four positions.... where the Full indicator is at 3 o'clock, 6, 9 or 12. That means a potential of a 25% error if not positioned properly.
I found this video that explains how the tank level and manual gauge vs electronic gauge works.
Based on this video, I'm going to assume that for a horizontal tank should have the gauge / sending unit where it is readable such that the Full indicator is 3 o'clock.
From what I found reading more about the sender is that it works based on resistance. Most of the horizontal tanks used in RV's require a sending unit that is based on a 0 to 90 Ohm reading. As the float inside the tank moves the resistance changes and that results the level reading inside the coach.
So if the readout is no matching the actual amount of propane in the tank it would either be a problem with the float or a bad sending unit.
The sender on my tank is this one.....
https://www.amazon.com/Manchester-Ta...09373264&psc=1
So after all that..... I'm not sure there is an adjustment for the sending unit.
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10-06-2020, 11:30 AM
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#7
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Senior Member
Brand: Thor Motor Coach
Model: Quantum RQ29
State: Ohio
Posts: 1,296
THOR #13648
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Nice video Judge. I always wondered how those gauges worked. My inside gauge on my control panel and the gauge on the tank itself always agree, but I wonder how accurate they actually are. Anyone have any thoughts on that?
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10-06-2020, 12:16 PM
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#8
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Senior Member
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,164
THOR #12751
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LPG guage and control panel don't match
I’m guessing there is a variance between actual and reported levels of 10 - 20% given it’s magnetic and not a direct connection between the float and the gauge.
You have to think that the level of the coach will have some effect on the reading since it is the liquid moving the float.
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10-06-2020, 12:57 PM
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#9
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Junior Member
Brand: Thor Motor Coach
Model: Chateau 22b
State: New York
Posts: 24
THOR #6388
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All, I'm not sure how to troubleshoot the issue. I don't know if its the sender that isn't changing resistance or the control panel not reading the resistance. One day it was working the next not. I guess I could cut the wires and read the resistance of the sender by using an ohmmeter. Assuming the resistance is linear 1/2 full would be 45 ohms etc. If the sender is changing resistance then it must be the control panel circuit that's faulty.
Any other thoughts?
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10-06-2020, 01:40 PM
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#10
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Senior Member
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,884
THOR #6826
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I’m usually a pretty anal sort of a fellow, but speaking for myself I wouldn’t worry about it. Coach panel gauges are notoriously inaccurate as are cheap gauges like they put on tanks. I fill up my tank when both are showing that it’s getting low. Then knowing how much it took to fill it up and what he capacity of the tank is I can judge accuracy for the next time. It that’s just me.
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10-06-2020, 02:02 PM
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#11
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Senior Member
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,164
THOR #12751
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Quote:
Originally Posted by El Pirate
All, I'm not sure how to troubleshoot the issue. I don't know if its the sender that isn't changing resistance or the control panel not reading the resistance. One day it was working the next not. I guess I could cut the wires and read the resistance of the sender by using an ohmmeter. Assuming the resistance is linear 1/2 full would be 45 ohms etc. If the sender is changing resistance then it must be the control panel circuit that's faulty.
Any other thoughts?
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The only thing I can think of is to go to a Propane Distributor who specializes in tanks, etc. They may have a way to test that the float and sender are working properly.
The sending unit is about $50 so a bit expensive to buy one to try if it is not the problem.
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10-06-2020, 03:31 PM
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#12
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Senior Member
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,164
THOR #12751
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So I decided to do a little experiment..... to prove the magnetic float and sender unit do actually work the way they should. Maybe this will also help the OP and others troubleshoot an issue with the propane tank readings.
I took my sender, which was reading about 1/2 on the gauge and about 60% on my Firefly display and rotated it about 45 degrees.
As you can see from the pictures it went to about 3/4 full, which is what I would have expected given its magnetic. My Firefly display read 100%. I wasn’t too surprised because I noticed it read full a long time and until the gauge visually dropped below 3/4 on the gauge.
To me it looks like the sender can only be installed one way (or perhaps 180 degrees in the other direction). I didn’t want to force it since there are plastic tabs that hold it in place. It seems to just want to go easier in the original position.
Based on my experiment, the gauge / sender should be installed with the Full mark being at 3 o’clock on a horizontal tank and there is no adjustment that can be made. I would also say the most accurate reading is probably on the gauge itself.... but I can’t confirm that to be true.
All that being said, this would be a good way to verify the electrical sending unit is sending the proper signal back to the inside display panel with the propane level reading.
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10-06-2020, 06:13 PM
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#13
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Member
Brand: Thor Motor Coach
State: Georgia
Posts: 84
THOR #14989
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The pic for gauge is taken so you can read gauge it is at 3/4 full. Just filled tank. The second pic is the monitor panel inside coach it is reading "Disc". The sensor outside cannot be "adjusted" one way or the other. It says it is a Manchester tank LP Sensor.
This has happened before and it resolved itself.
Any suggestions?
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10-06-2020, 07:05 PM
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#14
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Senior Member
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,164
THOR #12751
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Quote:
Originally Posted by Windsport_29_M
The pic for gauge is taken so you can read gauge it is at 3/4 full. Just filled tank. The second pic is the monitor panel inside coach it is reading "Disc". The sensor outside cannot be "adjusted" one way or the other. It says it is a Manchester tank LP Sensor.
This has happened before and it resolved itself.
Any suggestions? Attachment 26529Attachment 26532
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Did you try removing the sensor and repositioning like I did in my experiment to see if your display changes? Might be worth a try.
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10-06-2020, 07:13 PM
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#15
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Member
Brand: Thor Motor Coach
State: Georgia
Posts: 84
THOR #14989
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Hi thank you for your response.
The sensor has plastic clips holding it on. Is your sensor held on the same way?
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10-06-2020, 07:15 PM
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#16
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Member
Brand: Thor Motor Coach
State: Georgia
Posts: 84
THOR #14989
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Also the sensor is showing full and monitor in coach is on empty "Disc".
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10-06-2020, 07:16 PM
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#17
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Member
Brand: Thor Motor Coach
State: Georgia
Posts: 84
THOR #14989
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Hey I get what you are saying. I'll try it and let you know.
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10-06-2020, 07:35 PM
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#18
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Senior Member
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,164
THOR #12751
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Quote:
Originally Posted by Windsport_29_M
Hi thank you for your response.
The sensor has plastic clips holding it on. Is your sensor held on the same way?
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That is correct. It has three plastic clips / fingers that hold it to the pentagonal fitting on the tank.
Be careful trying to reposition it. I think it really is meant to only go on one way so you don't want to break the clips.
You could just hold the sender against the pentagonal fitting and rotate it with your hand while someone inside sees if the level changes. The gauge should move as you rotate it and the level inside should change as well.
That will tell you that the sending unit is registering the different levels and the the inside display is getting that data.
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10-07-2020, 11:48 AM
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#19
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Junior Member
Brand: Thor Motor Coach
Model: Chateau 22b
State: New York
Posts: 24
THOR #6388
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LPG guage and control panel don't match.
I found an easy way to troubleshoot the guage without breaking the clips. Disconnect the gauge from the wire to the panel ( cut) short the leads from the panel together. should read 0 on the panel. open the wires, should indicate full and put a 44 or close to it ohm resister across the panel leads, it should indicate 1/2 full. It might be hard to get a resistor unless you have dabbled in electronics and have some spares laing around. Turns out it was the variable resistor in the guage that was faulty. Thanks to all for your Reponses.
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10-07-2020, 12:05 PM
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#20
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Thanks for letting us know what you found, and congratulations on fixing it!
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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