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PostPosted: Thu Jan 17, 2019 9:33 am 
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Hi all,
I had three Heatmiser DS1-L thermostats installed in my house about three years ago, to control underfloor heating in three separate zones. Recently, one of the sensors appears to have developed a fault. When the heating is triggered to switch on (for example, in the morning, the measured temp is say 17 degC, and the thermostat is set to 21 degC), the heating appears to momentarily switch on normally, and then immediately switch off again, and 70.0 deg C is momentarily displayed on the screen. A second or two later, it shows the room temp again (17 deg C), and then it repeats. so it keep clicking on and off, showing 70.0 deg, then back to room temp - but it never actually stays on. The heating temp measured at the valve system is c 35 deg C, so the 70.0 deg C reference seems to be some sort of default failure display.
Just this morning, a second of the three sensors has started to do the same thing - though this one seems to stay on for about 10 seconds, before it shows 70.0 Deg C, and switched off again.
Can anyone help? Is this a known fault with the DS1-L?
Many thanks
Rob


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PostPosted: Thu Jan 17, 2019 10:01 am 
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If one fails, oh dear. For two to fail implies something else is wrong or they have reached the "end of their life" (Short that it was) either way they are out of guarantee, I would suggest change all of them for a different brand.

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PostPosted: Thu Jan 17, 2019 10:31 am 
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someone-else wrote:
If one fails, oh dear. For two to fail implies something else is wrong or they have reached the "end of their life" (Short that it was) either way they are out of guarantee, I would suggest change all of them for a different brand.

THanks - that is my fear (short life). Just wondered if anyone else had the same experience..


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