Question about Honeywell Programmable Thermostat Heater

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Red LED on honeywell r6660d

I have a two zone thermal control on my boiler one s a honeywell cm61 and the other is a honeywell r6660d. I believe the r6660d is the base unit recieving a radio signal from the cm61 as it is wired to the boiler. I now have both the green LED and the red LED showing. why has the red LED come on and what does it signify?

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  • Anonymous Nov 30, 2008

    exactly the same please help!!

  • Anonymous Jan 05, 2009

    Same problem here

  • Stephen Morgan Oct 02, 2012

    I have the same problem but I have a CM927. Can anyone help?

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The problem is that the 2 units are "not speaking to each other". this could be caused by low batteries or a loss in signal caused by a powercut or an objection in the way of the 2 units.

first you need to turn the power off to the r666od (or otherwise known as the HC60NG) for 10 secs, then turn back on. then hold the grey button in for 15 secs. release then hold in for a further 5 secs.

go to the honeywell cm61 press the off button. hold temp up. temp down and prog 1 in for 3 secs until the dipslay goes to INST. at this point release all 3 buttons then press the i button until a beacon starts flashing.

this is now the end to your problem.

N.B the reason the green light was on is because the man override button will have been pressed.

hope this helps

Posted on Feb 11, 2009

  • Mr James yarr Oct 24, 2015

    Had heating engineer round yesterday.He serviced the boiler but failed to solve the problem with the sender and receiver units communicating with each other.5 mins on your site and problem solved .Brilliant.!

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It's work, thank very much

Posted on Sep 28, 2012

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THE BINDING OPERATION DESCRIBED BELOW IS REQUIRED IF:

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