Question about Honeywell Programmable Thermostat Heater

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Biasi combi boiler with red light flashing at honeywell r6660d

Hi could you help i have no manual to the r6660d

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Here is the biasi site that should have your manual. With no model number, I hope this helps.

Posted on Feb 17, 2014

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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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