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Nest t-stat needs 24v

A customer called today in a panic when his newly installed Nest did not work and the online customer support was of no help. A new 24 volt honeywell transformer and an unused 18/3 line later, and the heat was back on. The system is heat only, oil fired Olsen warm air that only had 18/2 to the Carlin primary. For the price of the Nest, perspective purchasers should take note and plan on calling a heating professional.


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  • Nick W
    Nick W Member Posts: 200
    Won't work on White-Rodgers 3-wire zone valves.

    A neighbor called yesterday. She had just shelled out about eight Benjamins for three Nests. She was confused about a "black wire" and asked me what it was for. I told her the Nests won't work on her White-Rodgers zone valves and to take them back. I suggested she buy White-Rodgers1F80-0471s. She has older 1F97W-71s, but has trouble resetting them when she replaces the batteries.
  • hotpipe
    hotpipe Member Posts: 24
    i would

    Be interested to know what the amp draw is per t-stat, if one 40VA could handle multiple Nests.

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