Honeywell T8000C, T8001C, T8011R, T8024C Troubleshooting Manual

Display does not come on

• Check if the thermostat is mounted and latched on the wallplate—mount and latch the thermostat on the wallplate.
• Check if the circuit breaker is tripped—reset the circuit breaker.
• Check if the fuse is blown—replace the fuse.
• Check if the switch at the equipment is in the Off position—set to the On position.

Temperature settings do not change

• Check that the temperature set points are: between 40 to 99°F (4 to 37°C).

Heating does not come on

• Check if the circuit breaker is tripped—reset the circuit breaker.
• Check if the fuse is blown—replace the fuse.
• Check if the switch at the equipment is in the Off position—set to On position.
• Wait five minutes for the system to respond.
• Set SYSTEM switch to Heat.

Cooling does not come on

• Check if the circuit breaker is tripped—reset the circuit breaker.
• Check if the fuse is blown—replace the fuse.
• Check if the switch at the equipment is in the Off position—set to On position.
• Wait five minutes for the system to respond.
• Set SYSTEM switch to Cool.