Owner`s manual

32
16. Troubleshooting for Technician
Problem Solution
The display does not light
The unit is not getting 24Vac - Check the wiring
connections, R (Phase), C(common).
Temperature in the room
(display) dropped to 0°F
The temperature sensor is sensing an OPEN
CIRCUIT.
Replace the jumper JMP1. If the temperature
returns to normal - there is a problem with the
external sensor.
Temperature in the room
(display) rises to 99°F
The temperature sensor is sensing a SHORT
CIRCUIT.
The unit does not respond to
buttons and "EC" appears in the
display
The unit is in Economy Mode.
To return to normal mode, see #8.
In heat mode, unit sends cool air The Auto Fan is not ON.
TEL appears on the display
The thermostat is currently calling or receiving a
call.
Reset the unit – See #11