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Old 06-15-2021, 11:36 AM   #1
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Tecma

Our back bathroom wonít flush because the red light is on. I just dumped the tanks so anyone have any ideas.
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Old 06-15-2021, 11:37 AM   #2
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We have that same toilet in our Phaeton. When it comes up with the red light and the tank is not full, I can use the black tank flush for a few minutes and it clears up. Apparently it cleans some of the "crud" off the inside wall of the tank that causes a misread.
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Old 06-15-2021, 11:54 AM   #3
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Try holding one of the switches down for 3+ seconds.

That could do an emergency flush.
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Old 06-15-2021, 12:01 PM   #4
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The adhesive foil strips that attach to outside of the gray and black tanks and are how the tank level sensors readings are sensed on older model Entegras (maybe before 2021??) often come off and fail. Often, bad readings and inaccurate readings are due to those sensors coming off or even coming off and shorting against each other. That is where I would start looking.

The sensor on the newer coaches are already notorious for not giving accurate readings and are a problem all their own.

Gary
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Old 06-15-2021, 03:40 PM   #5
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The sensors for the Thetford Tecma toilet are separate from the sensors for the black & gray holding tanks. I don't believe that any malfunctioning black/gray tank sensor would have any effect on the Thetford Tecma toilet.

From the Tecma Owner's Manual:

Holding Tank Level Sensors
This Tecma toilet system has Tank Level Sensors mounted on the outside of the black water tank.
FULL TANK LOCKOUT: For the safety of your system, the toilet will not flush when the Full Tank Sensor senses a full tank (LED is red).
EMERGENCY OVERRIDE: If the tank is full (LED is red) and an emergency flush is needed, press and hold either flush button for 6 seconds to flush toilet. CAUTION: This may cause overfilling of a waste tank and system back up. will flash.

Doing a thorough black tank flush may be beneficial. The full tank sensor (red) will be very close to the top of the tank. Unless you completely fill the black tank during the tank flush, you may not be successful. Be very careful during that tank flush. that you constantly monitor the water level in the tank. You really don't want to fill the black tank to overflowing during the flush process.

If you can't clear the red warning after several tank flushes, I'd expect that your problem is something beyond a contaminated tank causing an erroneous full sense. Perhaps a bad sensor, bad controller or wiring issue.

Good luck.

In the mean time, a 6 second press and hold on either flush button should get the toilet to flush.

Take care,
Stu
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Old 06-15-2021, 06:36 PM   #6
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Quote:
Originally Posted by 777 Driver View Post
The sensors for the Thetford Tecma toilet are separate from the sensors for the black & gray holding tanks. I don't believe that any malfunctioning black/gray tank sensor would have any effect on the Thetford Tecma toilet.



From the Tecma Owner's Manual:



Holding Tank Level Sensors

This Tecma toilet system has Tank Level Sensors mounted on the outside of the black water tank.

FULL TANK LOCKOUT: For the safety of your system, the toilet will not flush when the Full Tank Sensor senses a full tank (LED is red).

EMERGENCY OVERRIDE: If the tank is full (LED is red) and an emergency flush is needed, press and hold either flush button for 6 seconds to flush toilet. CAUTION: This may cause overfilling of a waste tank and system back up. will flash.



Doing a thorough black tank flush may be beneficial. The full tank sensor (red) will be very close to the top of the tank. Unless you completely fill the black tank during the tank flush, you may not be successful. Be very careful during that tank flush. that you constantly monitor the water level in the tank. You really don't want to fill the black tank to overflowing during the flush process.



If you can't clear the red warning after several tank flushes, I'd expect that your problem is something beyond a contaminated tank causing an erroneous full sense. Perhaps a bad sensor, bad controller or wiring issue.



Good luck.



In the mean time, a 6 second press and hold on either flush button should get the toilet to flush.



Take care,

Stu


Thank you everyone I will try all the suggestions tmw
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Old 06-15-2021, 08:15 PM   #7
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Stu

I am surprised that you dismiss the possibility of a bad or faulty sensor. If you read the final paragraph of the section of the owners manual that you quote, you will find this sentence....

"...If you can't clear the red warning after several tank flushes, I'd expect that your problem is something beyond a contaminated tank causing an erroneous full sense. Perhaps a bad sensor, bad controller or wiring issue..."

New model coaches, maybe 21 and 20 use a completely different type of sensor that I believe gets into the tank from above. Those can fail also. However, I believe in the OPs 2019 is still the SeeLevel system which uses the metal bands.

Gary
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Old 06-15-2021, 08:42 PM   #8
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You might give this a try: Last time we were out, the red light come on after I'd dumped and flushed the black tank (flushed with ~80% full tank).

It stayed red for the next 2 days, so I dumped a bottle of pine cleaner into the 1/2 bath stool, filled the tank to 96%, and emptied the tank.

That did it - the green light was on, and worked well (amber on at 46%) the rest of the trip.

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Old 06-15-2021, 10:07 PM   #9
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Happens in our coach on a regular basis. The tank will be at 20-25% and weíll get a red light. We override when needed, dump PineSol (or Dollar Store equivalent) and Calgon in the tank if itís not already there and, if itís not a drive day, fill it up and let it set for about 15 minutes and then dump and flush. If driving we fill it to about 70% and then drive to our next stop and dump and flush.
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Old 06-16-2021, 06:35 AM   #10
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For me it was dirty sensors, and I didn't want to wait to clean the tank (which I did later) So I just unplugged the sensors at the back of the toilet.
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Old 06-16-2021, 07:10 AM   #11
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Quote:
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For me it was dirty sensors, and I didn't want to wait to clean the tank (which I did later) So I just unplugged the sensors at the back of the toilet.
That won't work on an Entegra, although I've seen that work on older coaches on other brands. There are two Tecma sensors that are stuck to the side of the black tank with adhesive. The one in the middle controls the amber warning light. The one at the top controls the red light, and the flush lockout procedure (which can be over-ridden as mentioned in the above posts) when the tank is full. On our 2016 we have two Tecmas - one in each bath. Each toilet has their own set of sensors. The one toilet worked fine but the other was always tripping out the red sensor, causing a flush lockout condition.

I tested the sensors by unplugging them. That didn't work. I also tried to jumper the wiring harness but that didn't work. I tested them with an ohmmeter but that didn't work because it turns out that the sensors actually communicate digitally with the controller so you can't remove or bypass them. My solution was to pry the problem sensor off the tank wall and use a nylon cable tie to strap the sensor to a wiring loom so that it was looking into space instead of at the tank. Problem resolved! I don't have a functioning red sensor on one toilet but that's not a concern because I'm always keeping an eye on tank levels anyway.
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Old 06-16-2021, 09:57 PM   #12
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Quote:
Originally Posted by Gary.Jones View Post
Stu

I am surprised that you dismiss the possibility of a bad or faulty sensor. If you read the final paragraph of the section of the owners manual that you quote, you will find this sentence....

"...If you can't clear the red warning after several tank flushes, I'd expect that your problem is something beyond a contaminated tank causing an erroneous full sense. Perhaps a bad sensor, bad controller or wiring issue..."

New model coaches, maybe 21 and 20 use a completely different type of sensor that I believe gets into the tank from above. Those can fail also. However, I believe in the OPs 2019 is still the SeeLevel system which uses the metal bands.

Gary
Hi Gary,

I'll beg your forgiveness by offering an explanation: I was a math major because I'm generally better with numbers than words.

So, I apparently confused you by not being clear about the end of the quote from the Tecma Owner's Manual and the beginning of my opinion. The section that you quoted (I've changed the color of that text to blue), came not from the Owner's Manual, rather from my opinion.

It's been my experience that many of the tank sensor problems come from foreign matter stuck on the inside of the tank wall. IF foreign matter is the cause of the problem, rinsing the tank is an easy first step in troubleshooting. If rinsing/cleaning the inside of the tank doesn't fix the problem, moving on to troubleshoot other (more expensive) components in that system is appropriate.

There is one issue that it's important to understand, though. There are two tank level sensing systems. One system, the SeeLevel system is the system that's connected to the VegaTouch and the tank level display in the wet bay. That system senses tank levels in the fresh/black/gray tanks (battery voltage, too). To the best of my understanding, that sensor system (SeeLevel) is not, in any way, connected to the sensors that are part of the Tecma sensor system. A completely inoperative/erronious SeeLevel system will have no effect on the Tecma system. The red LED on the Tecma control panel has nothing to do with the SeeLevel system.

Sorry for the confusion.

Take care,
Stu
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Old 06-19-2021, 09:01 AM   #13
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Thanks for all the advice put some Calgon in and rinsed it good worked for about 12hrs. So going to the store for Pine Sol and will try again

Thanks again
Deb
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Old 06-19-2021, 09:05 AM   #14
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Deb, this has worked for me keeping the sensors clear. I have not had a sensor problem since I started using this method in 2014. It is amazing what will come out of the tank the first time this is done even after the tank has been cleaned.
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