Honeywell T7350 Benutzerhandbuch

63-2605—5

24

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 RC 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 to configure cooling response.

System selection is set to Off or Heat.

Set system selection to Cool or Auto.

DAT low limit has been reached, or 

OAT lockout is engaged.

• If the setpoints are correct, do nothing.

• Use PDA (Cooling Config) to adjust or disable DAT low 

limit and/or OAT lockout.

• Check HVAC equipment to ensure proper operation.

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 via relay is yet given.

For T7350M models only: Check the information screens. 

MODHEAT or MODCOOL percentages of zero and 100 

indicate an extreme signal from the given terminal. See 

Table 15 for details.

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 Test 

Mode.