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I have a Drayton Digistat RF1 with SCR thermostat for my central heating which is about three years old now. It has worked well up to now, but has developed a problem. The red continuous light (alarm) on the SCR keeps appearing. When the thermostat sends a signal the red light flashes and then goes out and the green either appears or doesn’t depending on the thermostat setting (and the motorised valve for my heating opens – if green). However, after less than a minute the green goes out and the red appears (continuous) again and the motorised valve closes. The red stays continuous until the thermostat transmits again and the cycle repeats. When I change the temp setting this initiates the transmitter and the cycle starts again – green for 50 secs, then revert to alarm and valve off. Manual override similarly gives green and red for less than a minute, then green goes out and the valve closes. I put new batteries in the RF1 thermostat and cleaned and checked the terminals, just in case – no difference. I have tried disconnecting the batteries and turning off the power to the receiver and then going through learn mode, however each time green light extinguishes after less than a minute and valve closes. I assume the SCR is caput and I need a new system, but just checking with you before going ahead. Drayton/Invensys customer support hasn't helped.

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  • orley Nov 23, 2008

    On going through websites, I see that I can buy a new Digistat SCR separately (frequency OK at 433MHz), so hopefully that might be the solution. Anyone think I ought to go for a complte kit instead?

  • orley Nov 30, 2008

    When the problem was posted, it had been going on for a couple of weeks. Two days after I posted it, the receiver started working normally again. As far as I can see, I did nothing to change things. It has now worked perfectly for 5 days. Let's hope this continues. I am not sure what lesson anyone else might draw from this, except to hang on in and hope it comes right by itself.

  • Anonymous Dec 26, 2008

    I have exactly the same problem. The thermostat shows room temp as 22c, however, I know that is isn't as I still have to wear 2 layers of clothing. My boiler is fine, hot water is hot. However, the digistat does not want to work when the weather is extremely cold! That's when you need it. Still hoping and praying that it will correct itself, otherwise give me a sysytem with wires, anytime.


3 Suggested Answers

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SOURCE: Drayton Digistat SCR thermostat not working.

Go online to who deal with this type of boiler. It would be very difficult to troubleshoot this boiler with the information supplied. I hope this will be of some help to you.
Sincerely, Shastalaker7
They should also be able to get you a manual for your thermostat.

Posted on Oct 31, 2009

  • 122 Answers

SOURCE: Is it possible ot obtain

You can get the Manual here:

Drayton Digistat RF2 wireless room thermostat

Posted on Sep 16, 2010

  • 30 Answers

SOURCE: drayton digistat 3 instruction manual

Posted on Nov 14, 2010

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Sincerely, Shastalaker7
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