23
Hardware Failure (HF) Errors —
A Hardware Fail-
ure (HF) error is an error that corresponds to a hardware failure
at the TEMP system thermostat, associated sensors, or zone
damper.
To clear an HF Error, the component responsible for initiat-
ing the HF Error must be adjusted, repaired, or replaced. See
Table 5 for a description of HF errors.
Table 5 — Hardware Failure Errors
ZONE TEMPERATURE SENSOR OUT OF RANGE — An
HF03 error is issued when the zone temperature sensor is read-
ing below 30 F or greater than 180 F. The zone temperature
sensor can be recalibrated. The HF03 error will automatically
clear when the sensor reading is back within the allowable
range.
To check the zone temperature sensor:
1. Check that the zone temperature sensor is physically in-
tact on the TEMP system thermostat printed circuit
board. Ensure the sensor is not shorted against the TEMP
system thermostat printed circuit board.
2. If using a remote room temperature sensor, check for
proper wiring connections (red to +, black to -). Check for
other wiring running parallel to and less than 12 in. from
the remote room sensor wiring. Avoid running AC, con-
trol, or communication bus wiring near the remote room
sensor wiring. Maintain a minimum separation of 12 in.
or more between other wiring and remote room sensor
wiring.
3. Check the zone temperature sensor calibration. Calibrate
the sensor by manual calibration at the TEMP system
thermostat using the Zone Temperature Sensor Calibra-
tion function (category 5, option 2) and an accurate ther-
mometer. Measure the temperature at the TEMP system
thermostat zone temperature sensor location using the ac-
curate thermometer. Wait for the reading to stabilize. Us-
ing the set point buttons, increase or decrease the temper-
ature display to match the reading of the thermometer.
REMOTE ROOM SENSOR OUT OF RANGE — An HF04
error is issued when the remote room temperature sensor is
reading below 30 F or greater than 180 F. The remote room
temperature sensor can be recalibrated. The HF04 error will
automatically clear when the sensor reading is back within the
allowable range.
To check the remote room sensor:
1. Check that the remote room sensor wiring and connec-
tions to the circuit board are physically intact. Ensure the
5-conductor control wiring running between the relay
pack and the TEMP system thermostat is not run near
AC, control, or communication bus wiring. Maintain a
minimum separation of 12 in. or more between other wir-
ing and remote room sensor wiring.
2. Check the remote room sensor calibration. Calibrate the
sensor by manual calibration at the TEMP system
thermostat using the Remote Room Sensor Calibration
function (category 5, option 3) and an accurate thermom-
eter. Measure the temperature at the remote room temper-
ature sensor location using the accurate thermometer.
Wait for the reading to stabilize. Using the set point but-
tons, increase or decrease the temperature display to
match the reading of the thermometer.
DUCT TEMPERATURE SENSOR OUT OF RANGE — An
HF05 error is issued when the duct temperature sensor is read-
ing below 30 F or greater than 180 F. The duct temperature
sensor can be recalibrated. The HF05 error will automatically
clear when the sensor reading is back within the allowable
range.
To check the duct temperature sensor:
1. Check that the duct temperature sensor wiring and con-
nections to the relay board are physically intact. Ensure
the 5-conductor control wiring running between the relay
pack and the TEMP system thermostat is not run near
AC, control, or communication bus wiring. Maintain a
minimum separation of 12 in. or more between other wir-
ing and remote room sensor wiring.
2. Check the duct temperature sensor calibration. Calibrate
the sensor by manual calibration at the TEMP system
thermostat using the Duct Temperature Sensor Calibra-
tion function (category 5, option 5) and an accurate ther-
mometer. Measure the temperature at the duct tempera-
ture sensor location using the accurate thermometer. Wait
for the reading to stabilize. Using the set point buttons, in-
crease or decrease the temperature display to match the
reading of the thermometer.
HARDWARE NOVRAM FAILURE — An HF06 error is
issued when the TEMP system thermostat detects a problem in
its non-volatile memory. If the TEMP system thermostat is
able to correct the problem, the error will clear in approxi-
mately 10 minutes. If the condition persists, the TEMP system
thermostat must be replaced.
HARDWARE A/D FAILURE — An HF07 error is issued
when the TEMP system thermostat detects a problem with its
analog/digital converter circuitry. If the TEMP system thermo-
stat is able to correct the problem, the error will clear in
approximately 10 minutes. If the condition persists, the TEMP
system thermostat must be replaced.
DX COIL TEMPERATURE SENSOR OUT OF RANGE —
An HF09 error is issued when the DX coil temperature sensor
is reading below 30 F or greater than 180 F. The DX coil tem-
perature sensor can be recalibrated. The HF09 error will auto-
matically clear when the sensor reading is back within the
allowable range.
To check the DX coil temperature sensor:
1. Check that the DX coil temperature sensor wiring and
connections to the circuit board are physically intact. En-
sure the 5-conductor control wiring running between the
sensor, relay pack, and the TEMP system thermostat is
not run near AC, control, or communication bus wiring.
Maintain a minimum separation of 12 in. or more be-
tween other wiring and remote room sensor wiring.
2. Check the DX coil temperature sensor calibration. Cali-
brate the sensor by manual calibration at the TEMP sys-
tem thermostat using the DX Coil Temperature Sensor
Calibration function (category 5, option 7) and an accu-
rate thermometer. Measure the temperature at the DX coil
temperature sensor location using the accurate thermome-
ter. Wait for the reading to stabilize. Using the set point
buttons, increase or decrease the temperature display to
match the reading of the thermometer.
ERROR
PROBLEM
ALARM
PRIORITY
HF03
Zone Temperature Sensor Out of Range
2
HF04
Remote Room Sensor Out of Range
2
HF05
Duct Temperature Sensor Out of Range
2
HF06
Hardware NOVRAM Failure
2
HF07
Hardware Analog/Digital Failure
2
HF09
DX Coil Sensor Out of Range
2
HF10
Outdoor-Air Temperature Sensor
Out of Range
2
HF11
Humidity Sensor Out of Range
2