Troubleshooting - Honeywell T8090A Owner's Manual

Troubleshooting

Your Honeywell thermostat requires little or no attention. Most problems can generally be traced
to the following:
Problem
No heat.
Applicable to heating-cooling subbase only.
1
Check
— system switch. May be in OFF
or COOL position. 1
— fuse or circuit breaker.
— furnace power switch. May be
Off.
— pilot flame. May be out.
— thermostat connections.
Move system switch to HEAT position.
If blown or tripped, replace fuse or reset breaker.
Move switch to ON .
Relight pilot flame per furnace manufacturer's
instructions.
Turn Off power to furnace. Check for correct
terminal hookups. Repair any frayed or broken
wires. Firmly tighten all terminal screws. Turn
power On.
15
Action
Continued
69-0628B—1