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Old 12-14-2022, 03:38 PM   #15
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Newmar Owners Club
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Location: Tulsa, OK
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Originally Posted by Rd1 View Post
This is a helpful discussion,, thanks.

I tried flyboy's recommendation and the temp1(outside temp sensor) reads about 29k *Ω* which is about 36F and temp2 (bathroom) reads about 12k*Ω* which is about 69F. Both are correct. These numbers change as temps change. This seems to suggest they are functioning as designed. Just the original config file on the circuit board may be corrupted.

I found the attached Silverleaf tech ref. Not sure if I got that from Art or perhaps from someone else here on the forum. Hope fully helps others. The description on OmniScope (pg 24) suggests the default scripts can be reloaded using this tool.

After further discussions with SL, I understand they are not on the hardware design team, so they do not know if the processor (on tm250, others) contains only the program instructions and / or the memory for the default configurations. If the processor has both and is damaged, then presumably it can not be reloaded. And the processor must be replaced, which they can no longer do. You can send them the tm250 for a $60 diagnostic, if they can't fix it, you need to have it replaced. Tm250 is now ~$370. Omni ~$440.

The load status screen indicating 'Forced' load setting suggests there is damage to the original setting on the tm250 as well. However, they seem to function as well. This 'seems' to suggest a corrupted setting due to surcharge.

I can only presume these are just the result of a corrupted eproms and should recover with a reload. Proof will be in the pudding. Should have the omni by next week. It has been a few decades since I've looked at things at the harware level. Hope I can dust up the ol' brain.

As for the 'Dual Phase Capacity', the setting 'appears' to be variable. I've tried different numbers and it does not seem to make any difference.
I had posted previously about my AC issues, I had several discussions with Art and Newmar to pinpoint the issue. Art suggested replacing the charge bridge, and several test to help pinpoint the issue, I even swapped the Tm 250 with no help. Art suggested finding someone with a omniscope would help, I even tried to buy one but they didn't have any as they were changing design. I checked thermistor resistance and verified the ohm readings, bypassed silver leaf and thermistors by plugging a 10 button Dometic thermostat into the system and verified the Temp to the AC was correct while the Silverleaf was indicating 50 degrees in a 100 degrees space. Found local dealer with omniscope and with help of Art found nothing wrong and Art was baffled.

Long story short I took it to a dealer and left for 6 weeks where he parked it inside the shop and he worked on it when it was not properly working. Testing every leg of the process until he found a communications connecter in the AC duct, installed to aid in construction of the coach, had corroded and would intermittently provide a bad signal to the silverleaf. He removed the connector on both units and everything appeared correct for a few days until it started to mess up again, only this time the indoor temp faulted to 32 degrees. After a bunch of phone calls he finally found domestic had a batch of freeze sensors that plugged into the AC that were bad, so 2 new sensors fixed that.

This issue had been ongoing for a long time and it had been well documented with Newmar and Newmar had tech reps reaching out to help. So to my surprise after my dealer intervened on my behalf, Newmar stepped up and paid for the repair.
Jim Mefford
2018 New Aire 3343
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Old 12-14-2022, 04:49 PM   #16
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Spartan Chassis
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Originally Posted by Rd1 View Post
I can view all the thermostat setting and the actual readings of the temp sensors. I was easily able to modify the temp reading for the bathroom (992f) and change it to 67f which my own thermometer was displaying. The bath temp now displays correctly.
Thanks for the update. So using OmniScope you just changed the incorrect temperature reading to the correct one and all was good? The temperature reading updates correctly as the room area gets hotter or colder? That is interesting.

Keep us update on your progress. I’m really interested in your resolution of the 49A dual phase capacity setting. Thanks.
2018 Newmar Mountain Aire 4531
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Old 12-15-2022, 05:08 PM   #17
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Originally Posted by flyboy013 View Post
Thanks for the update. So using OmniScope you just changed the incorrect temperature reading to the correct one and all was good? The temperature reading updates correctly as the room area gets hotter or colder? That is interesting.
Yes, I was surprised too. Attached is the screen shot. It is one of the thermostat options from the main menu. Can't read the line due to the display problem. As I drilled down various setting I came across the tm250 service tool (attached screen) and zone 1 is the outside temp and it originally showed the 140f and zone2 was 990f for the bathroom. I just changed those numbers accordingly and the SL monitor got updated just the same.

All climate function work accordingly. SL is supposed to send me all the scripts. Once I have those, I hope to get more insight. For now, if I were to make a “guess”, the attached screen is where the SL monitor gets its displayed data. What ever number I type in this screen, shows up on the SL monitor accordingly. The data in this screen is likely updated based on its associated script which reads the temp sensor resistance as you had suggested earlier. Then the end result gets stored in this screen for display on the monitor. I think in my case, the script got whacked due to power outage and the resulting number was corrupted. both temps work accordingly.

It seems pretty simple, but it is working. Will learn more in time.. btw, I know this is not a pretty time to be around central Ohio, but if you are in the area, feel free to look me up.
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Old 12-22-2022, 09:46 AM   #18
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Thanks for the follow up and your perseverance. It is also incredible that the technician found that connector. Newmar is extremely poor in documentation as it relates to any wiring. This is something that a company with good engineering would have documented in a wiring schematic. Congratulations.
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