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Troubleshooting new digital thermostat: no heat!
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Travis Jordan
Posts: n/a
wrote:
We purchased a Honeywell RTH7400D unit (5+1+1). Now I'm feeling like
The old set was very simple: two wires connected. One to "R" and the
other to "4".
Old R - transformer power - connect to R on RTH7400
Old 4 - call for heat - connect to W on RTH7400
Don't ask why Honeywell shows it differently in their owner's manual.
For your application, their instructions are incorrect.
Enjoy.
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