Honeywell COMMERCIAL PROGRAMMABLE T7350 - Manual (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 ON S PEC ™ 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