109
HMI Fault Codes
Problem
Potential Cause
Corrective Action
Fire
There is an input from the fire detector.
Check wiring. Repair broken or loose
wiring connections.
Replace fire detector.
Smoke (optional)
There is an input from the smoke
detector.
Verify the smoke detector is set up
properly.
Check wiring. Repair broken or loose
wiring connections.
Replace smoke detector.
Gas PS High
(optional)
The board is receiving an input on the
gas pressure high terminal.
Adjust regulator or add regulator.
Check wiring. Repair broken or loose
wiring connections.
Replace switch.
Refer to
Gas PS Low
(optional)
The board lost input on the gas pressure
low terminal. There should be an input
when gas pressure is at the proper level.
Low gas pressure switch.
Check wiring. Repair broken or loose
wiring connections.
Replace switch.
Refer to
Supply Overload
Exhaust Overload Motor overload has tripped.
Check motor for debris.
Check contactor/motor wiring
connections.
Check overload reset button.
Check overload amperage setting.
Check motor bearings.
Stat Missing
(Return, Outside,
Intake, Discharge,
Space, Coil)
If the temperature sensor signal being
sensed is too low, a missing fault will be
active.
Install and wire sensor.
Check for faulty wiring, refer to
“Temperature Sensor” on page 122
.
Stat Broken (Return,
Outside, Intake,
Discharge, Space,
Coil)
If the temperature sensor signal being
sensed is too high, a broken fault will be
active.
Install and wire sensor.
Check for faulty wiring, refer to
“Temperature Sensor” on page 122
.
Space HMI Missing
One of the HMIs in the system is not
connected properly, or one of the settings
is not properly set.
Verify that the “# of HMIs” is set correctly.
Verify there is no damage to the HMI(s).
Verify loose or damaged wiring to HMI(s).
If space temperature is being utilized,
make sure “HMI Averaging” is set to ‘On’
for all space HMIs.
RTC 1 Temp Sensor Real-Time Clock (RTC) temperature
sensor located on MUA board.
Verify there is no damage to the MUA
board or the wiring to the MUA board.
