Set Thermostat - Honeywell CT40A Installation Instructions Manual

6 Set Thermostat

Move the temperature setting lever to the required
temperature comfort level.
Symptom
No heat.
Furnace turns on and off.
Major swings in temperature
of greater than 1°C (2°F)
when outside temperature is
stable.
Thermostat setting and
thermometer reading
disagree.
Table 2. Troubleshooting.
Problem
Blown fuse or tripped circuit breaker.
Furnace power switch is set to Off.
No pilot flame.
Incorrect connections to thermostat.
Other.
Burner on period is too short.
Burner on period is too long.
Thermostat affected by drafts or
radiant heat.
CT40A HEATING THERMOSTAT
7 Troubleshoot Thermostat
Your Honeywell thermostat requires minimal attention.
Most problems can be corrected as described in Table 2.
Replace fuse or reset circuit breaker.
Turn furnace power switch to On.
For standing pilot applications, relight pilot
flame per furnace manufacturer's
instructions.
With power to furnace set to Off:
• Tighten all mounting and terminal
screws.
• Repair frayed or broken wires.
Contact a qualified service technician for
assistance.
Remove the thermostat cover and move
the heat anticipator lever counter-
clockwise one scale mark. Replace the
cover and wait several hours for the
system to stabilize.
Remove the thermostat cover and move
the heat anticipator lever clockwise one
scale mark. Replace the cover and wait
several hours for the system to stabilize.
Contact qualified service technician to
change the location. The thermostat
should be about 1.5 m (5 ft) above the
floor and on an inside wall.
3
Corrective Action
69-0847B-1