Honeywell T8501 User Manual download pdf (Page 11)

T8501 MICROELECTRONIC THERMOSTATS

11 69-0925—4

Cooling will not

come on.

No power to the thermostat. • Check that C terminal is connected to the system

transformer.

• Check for 24 Vac between C and R or RC and Y terminals.

— If missing 24 Vac:

— check if the circuit breaker is tripped—reset the circuit

breaker.

— check if the system fuse is blown—replace the fuse.

— check if the power switch on the HVAC equipment is in

the Off position—set to the On position.

— check wiring between thermostat and HVAC

equipment—replace any broken wires and tighten any

loose connections.

— If 24 Vac is present, proceed with troubleshooting.

Thermostat minimum off time is

activated.

• Wait up to five minutes for the system to respond.

• Enter Installer Setup number 33. Reconfigure minimum off

time (if required).

System selection is not set to

Cool.

Set system selection to Cool.

System on indicator

is displayed, but no

heat is being

delivered.

Fan operation set for 00

(conventional heat) when it

should be set for 01 (electric

heat).

Enter Installer Setup mode number 02 and reconfigure the fan

operation.

Conventional heating equipment

turns on the fan when the

furnace has warmed up to

setpoint.

Wait a minute after seeing the On indicator and then check the

registers.

Heating equipment is not

operating.

Verify operation of heating equipment in self-test.

Outdoor tempera-

ture not displayed

Option not activated. Enter Installer Setup number 24 and set to 01. Thermostat must

have OT terminals and a C7089B1000 installed.

Outdoor

temperature

display is incorrect

Outdoor sensor is connected

incorrectly.

Refer to C7089B1000 installation instructions and check wiring

between the thermostat and sensor.

Wrong sensor. Replace sensor with C7089B1000 sensor.

Select Models

Table 5. Troubleshooting Guide. (Continued)

Symptom Possible Cause Action

1 2 ... 6 7 8 9 10 11 12

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Honeywell T8501 User Manual Page 11

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