Controls User Manual
– HPAH
Rev_20200811
Page 8 of 9
Alarm message “TST ERR”
There is a simultaneous call for auxiliary heating (W) and cooling (O), indicating an
error with thermostat wiring or setup. Ensure that the thermostat is wired as per the
Installation Instructions, and configured for heat pump systems, either single or 2
stage.
Not enough humidity removal in cooling mode
Reduce cooling speeds HPC1Fan and HPC2Fan.
Supply or return air temperature (SA_TMP or RA_TMP) reads -50 °C
This indicates the supply air temperature sensor is not properly connected to the
controller. Ensure that the sensor is connected as per the wiring diagram found in the
Installation Instructions and that no wires have become loose.
RA_TMP
is not used
and can be ignored. A failed supply air temperature sensor will put the system into
freeze protection.
Freeze protection errors (alarm message “FROZEN”)
This usually occurs when there is inadequate airflow for a given system.
Ensure that the air filter is not plugged and all ductwork is open
Ensure supply air temperature sensor is located after cooling coil and in the
supply air stream, not touching the coil, heat source, plumbing, etc.
Ensure the cooling setpoint temperature
CoolTmp
is not set too high
Decrease sensitivity of the freeze protection feature (see Freeze Protection above)
Table 3 User Mode (default)
Line 1
Line 2
Set.
Type
Description
Default
HP AirH
####
D
Display Display status of system
NO CALL
W1_Aux
(0)Off/(1)On
D
Input
Thermostat auxiliary heating W1 (ON/OFF)
W2_Aux
(0)Off/(1)On
D
Input
Thermostat auxiliary heating W2 (ON/OFF)
Y1_HP
(0)Off/(1)On
D
Input
Thermostat heat pump Y1 (ON/OFF)
Y2_HP
(0)Off/(1)On
D
Input
Thermostat heat pump Y2 (ON/OFF)
SA_TMP
###.# C
D
Input
Supply air temperature
RA_TMP
###.# C
D
Input
Return air temperature (display only, not used)
FAN_Spd
#### %
D
calc
Fan speed as a percentage
HPAH
##.## REV
D
Display Program name and revision number
2.00
* note: "D" in set. indicates variable is for display only and is not
settable