Author Topic: Isotherm Fridge Smart Sensor  (Read 156 times)

Offline NichBails

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Isotherm Fridge Smart Sensor
« on: September 09, 2019, 12:30:18 PM »
Hi
I suspect that the ASU Smart thermostat is faulty and I would like to bypass it with a mechanical thermostat. I was wondering if anyone has done this? How would I wire the new thermostat and what thermostat should I buy.
Many thanks in advance.
Bruce
Bruce & Lynda
Landrover Disco 4
Topaz II Dec 14
Australia we love

Offline Harry Lissimore

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Re: Isotherm Fridge Smart Sensor
« Reply #1 on: September 09, 2019, 05:34:51 PM »
A few of us have changed the thermostat, mainly because the original one worked on the temperature inside the fridge, and if the ambient room temperature was less than about 4 degrees, then the fridge would turn off. This saved power - no sense running it if the inside and outside temps are less than about 4.  However, with the fridge off, then the freezer wasn't working so things thawed out.  Apparently the Isotherm was made for boats, and the theory was that the ambient temperature never got to lower than 4 degrees so the freezer always stayed frozen.

We have taken our fridges to refrigeration places and they have replaced the thermostat with one that works on the freezer temperature like most fridges do I believe.  It is not an easy job and it cost me $253. Others paid a similar amount.

One Topaz owner had his done a lot cheaper, but the fridge never turned off.  This was because the sensor was measuring the fridge temperature, not the freezer temperature, so the temperature was never attained. Consequently this was fixed, at another cost.
Formerly 2002 TVAN, now a 2015 Topaz Savannah and 2014 Isuzu MU-X LST

Offline Rob M

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Re: Isotherm Fridge Smart Sensor
« Reply #2 on: September 09, 2019, 08:44:27 PM »
We have changed the thermostat in our Isotherm fridge.
The Australian agent is Webasto ph 1800244494. Robert is the person you need to speak with. They recognise that there is an issue with the installed thermostat and Webasto have a replacement thermostat available.
Even though our fridge was out of warranty they supplied the thermostat to their nominated agent and we paid the labour cost of having the new thermostat installed.
We found it easier to take the fridge out of the Topaz and then take it to the nominated agent.  Remove the 4 covering caps on side walls of the inside of the fridge and then use an Allen key to remove the screws.
Previously 2009 Tvan Canning and now Topaz Series2 towed by Landcruier 200 series

Offline NichBails

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Re: Isotherm Fridge Smart Sensor
« Reply #3 on: September 10, 2019, 11:27:36 AM »
Thanks very much for the reply. I phoned Robert and he was able to put me onto a repairer which is just what I was after. He suggested that they will probably replace the “smart thermostat” with a mechanical one.

Thank you
Bruce
Bruce & Lynda
Landrover Disco 4
Topaz II Dec 14
Australia we love

Offline Rob M

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Re: Isotherm Fridge Smart Sensor
« Reply #4 on: September 11, 2019, 08:21:23 PM »
It is worthwhile asking him to supply the new thermostat. He did that for us at no cost.
Previously 2009 Tvan Canning and now Topaz Series2 towed by Landcruier 200 series