18 69-0395—2
Troubleshooting
Your Honeywell thermostat requires little or no attention. Most problems can generally be
traced to the following:
1 Not applicable on heating-only model.
Problem
Check Action
No heat. — system switch. May be in OFF or
COOL position.
Move system switch to HEAT position.
— fuse or circuit breaker. If blown or tripped, replace fuse or reset
breaker.
— furnace power switch. May be
OFF.
Move switch to ON.
— pilot flame (where applicable).
May be out.
Relight pilot flame per furnace
manufacturer instructions.
— RH and W thermostat
connections.
Turn Off power to furnace. Check for
correct terminal hookups. Repair any
frayed or broken wires. Firmly tighten all
terminal screws.
1
(continued)
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