Troubleshooting Guide - Honeywell T7200D Product Data

T7200D,E, T7300D,E,F AND Q7300 SERIES 2000 PROGRAMMABLE COMMERCIAL THERMOSTATS AND SUBBASES
L1
(HOT)
Q7300 SUBBASE
A1
A2
A3
AUXILIARY
RELAY
CONTACTS
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
1
PROTECTION AS REQUIRED.
RELAY REQUIRED (R8222 OR SIMILAR).
2
Fig. 19. Use of external relay and transformer for
auxiliary loads greater than 1.6A.
Symptom
Display will not come on. Thermostat is not being powered.
Temperature display is
incorrect.
Temperature settings will
not change.
(Example: Cannot set
heating higher or cooling
lower.)
Unable to configure
Installer Setup
63-4355—4
L2
1
2
M4944
Table 13. Troubleshooting Information.
Possible Cause
Room temperature display has been
reconfigured.
Thermostat is configured for °F or °C
display.
Bad thermostat location.
Display shows two dashes and a degree
sign.
Upper or lower temperature limits were
reached.
The setpoint temperature range stops
were configured.
Keypad is locked. When a locked key is
pressed, LOC flashes on the LCD.
Installer Setup is locked out.

TROUBLESHOOTING GUIDE

Refer to Table 13 for troubleshooting information.
TO
LOAD
• Check that X terminal is connected to the system
transformer.
• Check for 24 Vac between X and R or RH terminals.
— If missing 24 Vac:
— check if the circuit breaker is tripped; if so, reset
the circuit breaker.
— check if the system fuse is blown; if so, replace
the fuse.
— check if the HVAC equipment power switch on
the is in the Off position; if so, set to the On
position.
— check wiring between thermostat and HVAC
equipment and replace any broken wires and
tighten any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
Enter Installer Setup number 37 and reconfigure the
display.
Enter Installer Setup number 14 and reconfigure the
display.
Relocate the thermostat.
Installer Setup 22 is set for remote sensing and the
sensor is missing or the circuit is open or shorted.
Check the temperature setpoints:
• Heating limits are 40 to 90°F (7 to 31°C)
• Cooling limits are 45 to 99°F (9 to 37°C)
Check Installer Setup number 34 and 35 and reconfigure
the setpoint stops.
• Reset DIP switch 1 on back of thermostat to enable
keypad.
• Enter Installer Setup number 25 or 40 and reconfigure
keypad lockout level.
Reset the DIP switch 1 on back of thermostat to enable
keypad.
22
Action