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Troubleshooting - Honeywell T8090A/191108A Owner's Manual

Heating or cooling thermostat and wallplate or heating/cooling thermostat and subbase
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Troubleshooting

Your Honeywell thermostat requires little or no attention. Most problems can generally be
traced to the following:
Problem
No heat.
69-0574—2
Check
— system switch. May be in OFF or
COOL position.
— fuse or circuit breaker.
— furnace power switch. May be Off.
— pilot flame. May be out.
— R and W thermostat connections.
— other problem.
Move system switch to HEAT position.
1
If blown or tripped, replace fuse or reset
breaker.
Move switch to ON.
Relight pilot flame per furnace manufacturers
instructions.
Turn Off power to furnace. Check for correct
terminal hookups. Repair any frayed or
broken wires. Firmly tighten all terminal
screws. Turn On power.
Contact a qualified service technician for
assistance.
14
Action
(continued)

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191108aQ682bT8090a