Honeywell Deluxe Programmable Thermostat Operation User's Manual page 24

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Troubleshooting Guide (continued).
Symptom
Heating will not
come on.
Cooling will not
come on.
System on
indicator
(flame=heat,
snowflake=cool)
is lit, but no
warm or cool air
is coming from
the registers.
Action
• Check that setpoint is above room
temperature.
• Check if the circuit breaker is tripped—
reset the circuit breaker.
• Check if the fuse is blown—replace
the fuse.
• Check if the system switch at the
equipment is in the Off position—set to
On position.
• If 24 Vac is present, proceed with
troubleshooting.
• Wait five minutes for the system
to respond.
• Set system selection to Heat.
• Check that setpoint is below room
temperature.
• Check if the circuit breaker is tripped—
reset the circuit breaker.
• Check if the fuse is blown—replace the
fuse.
• Check if the system switch at the
equipment is in the Off position—set to
On position.
• If 24 Vac is present, proceed with
troubleshooting.
• Wait five minutes for the system
to respond.
• Set system selection to Cool.
Wait a minute after seeing the flame or
snowflake and then check the registers.
24 69-1400–1