Troubleshooting - Honeywell Home CT62A Owner's Manual

Troubleshooting

Your thermostat requires little or no attention. Most problems can generally
be traced to the following:
Symptom
No heat.
Heater never turns off.
Thermostat setting
and thermometer
reading disagree.
Calibration
The CT62 Thermostats are calibrated at the factory using precise instruments
under closely controlled conditions. Recalibration should not be necessary.
Allow the thermostat to operate for several hours before checking the
calibration. The CT62 Thermostat vapor-filled dual diaphragm sensing
element is affected by barometric pressure and altitude. Temperature
deviations of 1°F (0.5°C) are normal. If the thermostat is mounted in a
suitable location and still appears out of calibration, check calibration as
follows:
Check Calibration
1. Turn the setting knob clockwise until the switch makes (clicking sound).
The heating equipment and fan start.
2. No recalibration is necessary if the thermostat switch makes with
the thermostat setting at the same temperature as indicated on the
thermometer.
3. If the thermostat setting differs from the thermometer, record the
temperature difference and recalibrate as instructed in the Recalibration
Procedure section.
Checkout
Make sure power is on at
main service panel. Turn the
temperature setting knob
fully clockwise .
Improper connections to
thermostat.
Other.
Turn temperature setting
knob fully counterclockwise
.
Thermostat affected by
drafts or radiant heat.
Thermometer is out of
calibration.
Action
Heater should start to warm up within
two minutes. If not, contact qualified
electrician to check thermostat and
heater.
With power to circuit OFF, tighten all
wiring connections. Repair any frayed or
broken wires.
Contact a qualified electrician for
assistance.
Heater should start to cool within
minutes. If not, turn off power at
the main service panel, and contact
qualified electrician.
Contact electrician to change the
location. The thermostat should be
about 5 ft (1.5m) above the floor and on
an inside wall.
Recalibrate. See "Recalibration
Procedure" on page 6.
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