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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Remote not workin


what's happened here is the cm61 ng and the reciver box have lost there connection you will have to "rebind" them then it will be fine -




THE BINDING OPERATION DESCRIBED BELOW IS REQUIRED IF:

· Any of the system components (room unit or relay box) are replaced

· HC60NG has incorrect or no binding data stored (e.g. when pre-bound system pack components have been mismatched)

· Interference with the RF signal has caused a communication failure

During the binding procedure keep approximately 1m distance between the room unit and the HC60NG

1 Turn off mains supply to HC60NG for 10 seconds. Re-connect supply.

2 Press and hold the HC60NG push button for 15 seconds to reset previously stored data. The red LED will start to flash at 0.1 s on/0.9 s off. Release the push button.

3 Press and hold the HC60NG push button for 5 seconds to enter the binding mode. Red LED flashing at 0.5 s on/0.5 off confirms the binding mode has been entered.

4 Move the CM67NG slider to the OFF position (CM61 push the OFF button) and press the TEMP , TEMP and PROG 1 buttons together. The CM61/67NG will display InSt.

5 Press the i button to send the binding signal. The red LED is switched off on the receiver box to confirm the successful binding operation. If the red light still flashes push the repeat steps 1-3 and press the the i button until binding is successful.


hope this is helpful

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