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I have a Honeywell CM927 Wireless controller with a R666OD relay box. The red light on the relay box ( adjacent to the boiler ) is flashing, and we can only switch the heating on from the boiler. ( the Controller, situated downstairs in hallway ) will not control the boiler. Any ideas?

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1 Answer

Honewell r666od


is it on the left or the right ?

Mar 04, 2014 | Honeywell Programmable Thermostat Heater

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Heating wont come on. honeywell system the request box in kitchen requesting for it to come on but thermostat not coming on and boiler in garage not kicking into action hve tried resetting both thermo


Check transformer near on on boiler circuit board. the transformer provides a low voltage power source to operate some thermostats and relays at the furnance control board. May need new transformer also check wiring to thermostat

Sep 25, 2017 | Honeywell Programmable Thermostat Heater

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I have a honeywell cm927 control unit, and the red light on the receiver keeps flashing. i can manually turn the boiler on and off at the HC6ONG receiver. i've tried the faqs in the manual but to no joy....


The red flashing light means that there is an issues with the RF comms between control unit and receiver. You can reset by switching the boiler off and back on and then re-sending the temperature signal. You need to check batteries in you thermostat and also the position as the signal could be interfered with or it may be too far away from the receiver.

Sep 25, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

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

Feb 15, 2009 | Honeywell Programmable Thermostat Heater

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Red LED on honeywell r6660d


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

Nov 14, 2008 | Honeywell Programmable Thermostat Heater

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