Honeywell T7350 User Manual download pdf (Page 19)

T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT

19 63-4368

Cooling will not

come on.

No power to the thermostat. Check that X terminal is connected to the system transformer.

Check for 24 Vac between X and RH terminals.

If missing 24 Vac:

• Check if circuit breaker is tripped; if so, reset circuit breaker.

• Check if system fuse is blown; if so, replace fuse.

• Check if the HVAC equipment power switch is in the Off position; if

so, set to the On position.

• Check wiring between thermostat and HVAC equipment. Replace

broken wires and tighten 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.

• Use PDA or L

ONSPEC™ to configure cooling response.

System selection is set to Off or

Heat.

Set system selection to Cool or Auto.

System indicator

(flame: heat,

snowflake: cool) is

displayed, but no

warm or cool air is

coming from the

registers.

The call for heat or cool is not yet

given.

Check if any stage indicators (dots next to the system indicator) are

displayed. With no display of stage indicators, no call for cool/heat is

yet given.

For the modulating T7350H1017 only: Check the information

screens. MODHEAT or MODCOOL percentages of zero and 100

indicate an extreme signal from the given terminal.

Conventional heating equipment

turns the fan on only after the

furnace has warmed to a setpoint.

Wait one minute after seeing the on indicator and then check the

registers.

Heating or cooling equipment is not

operating.

Verify operation of heating or cooling equipment in self-test.

Table 11. Troubleshooting Information. (Continued)

Symptom Possible Cause Action

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 43 44

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Honeywell T7350 User Manual Page 19

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