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Diagram honeywell wireless room thermostat system boiler model r6660d

Where can I find instructions on how to pair the control thermostats with the wall units ? (R6660D)

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  • Heating & Co... Master
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Honeywell web site will have all the information you need.

Posted on Mar 29, 2014

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Posted on Jan 02, 2017

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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.

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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.

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