Specifications
3. Check the damper actuator position to see if the traveler
arm has moved past the position sensor. If the traveler
arm is stuck at full open or full closed position, use the
following steps to correct the problem:
a. Disconnect the monitor thermostat from the wiring con-
nector board.
b. At the damper, using a flat head screw driver, turn the
traveler screw (located on the stepper motor) until the
traveler arm is midway between the full closed and
full open positions.
c. Reconnect the monitor thermostat.
4. Check for excessive inlet static pressure beyond the rated
ability of the damper actuator.
• ZD and RD zone dampers are rated for 18 in.-lb.
• The MA-08 actuator is rated for 18 in.-lb.
• The HTA-02 actuator is rated for 80 in.-lb.
• The HTA-03 actuator is rated for 45 in.-lb.
5. Check the wiring between the damper actuator and moni-
tor thermostat. If the green wire between the damper ac-
tuator and the monitor thermostat has lost continuity, the
monitor thermostat will constantly receive the indication
that the damper is fully closed.
To check the wiring, disconnect the monitor thermostat
and wiring connector board. Connect the monitor ther-
mostat and wiring connector board directly at the damper
board. If the error disappears, the field wiring or the con-
nections should be checked.
If the error is still present, the monitor thermostat circuit
board, the wiring connector board, or the damper actua-
tor circuit board is bad. To isolate the defective compo-
nent, replace components, one at a time, until the error
disappears.
ZONE TEMPERATURE SENSOR OUT OF RANGE — An
HF03 error is issued when the zone temperature sensor is
reading below 30 F or greater than 180 F. The zone tem-
perature sensor can be recalibrated. The HF03 error will au-
tomatically 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
intact on the monitor thermostat printed circuit board.
Ensure the sensor is not shorted against the monitor ther-
mostat 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, control,
or communication bus near the remote room sensor wir-
ing. 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 monitor thermo-
stat using the Zone Temperature Sensor Calibration func-
tion (category 5, option 2) and an accurate thermometer.
Measure the temperature at the monitor thermostat zone
temperature sensor location using the accurate thermom-
eter. Wait for the reading to stabilize. Using the set point
buttons, increase or decrease the temperature 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
five-conductorcontrolwiring runningbetweenthe damper
actuator and the monitor thermostat is not run near AC,
control, or communication bus wiring. Maintain a mini-
mum separation of 12 in. or more between other wiring
and remote room sensor wiring.
2. Check the remote room sensor calibration. Calibrate the
sensor by manual calibration at the monitor thermostat
using the Remote Room Sensor Calibration function
(category 5, option 3) and an accurate thermometer. Mea-
sure the temperature at the remote room temperature sen-
sor location using the accurate thermometer. Wait for the
reading to stabilize. Using the set point buttons, 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
reading below 30 F or greater than 180 F. The duct tem-
perature sensor can be recalibrated. The HF05 error will au-
tomatically clear when the sensor reading is back within the
allowable range.
NOTE: When a monitor thermostat is configured for con-
struction mode the supply air duct sensor will issue a HF05
alarm when a duct sensor is not connected.
To check the duct temperature sensor:
1. Check that the duct temperature sensor wiring and con-
nections to the damper actuator circuit board are physi-
cally intact. Ensure the five conductor control wiring running
between the damper actuator and the monitor thermostat
is not run near AC, control, or communication bus wir-
ing. Maintain a minimum separation of 12 in. or more
between other wiring and remote room sensor wiring.
2. Check the duct temperature sensor calibration. Calibrate
the sensor by manual calibration at the monitor thermo-
stat using the Duct Temperature Sensor Calibration func-
tion (category 5, option 5) and an accurate thermometer.
Measure the temperature at the duct temperature sensor
location using the accurate thermometer. Wait for the read-
ing to stabilize. Using the set point buttons, increase or
decrease the temperature display to match the reading of
the thermometer.
HARDWARE NOVRAM FAILURE — An HF06 error is
issued when the monitor thermostat detects a problem in its
non-volatile memory. If the monitor thermostat is able to
correct the problem, the error will clear in approximately
10 minutes. If the condition persists, the monitor thermostat
must be replaced.
HARDWARE A/D FAILURE — An HF07 error is issued
when the monitor thermostat detects a problem with its analog/
digital converter circuitry. If the monitor thermostat is able
to correct the problem, the error will clear in approximately
10 minutes. If the condition persists, the monitor thermostat
must be replaced.
DX COIL TEMPERATURE SENSOR OUT OF RANGE —
An HF09 error is issued when the DX coil temperature sen-
sor is reading below 30 F or greater than 180 F. The DX
coil temperature sensor can be recalibrated. The HF09 error
will automatically clear when the sensor reading is back within
the allowable range.
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