Specifications

EXAMPLE OF CLEARING AN SF ERROR — The moni-
tor thermostat displays an SF39 error. Look up SF39 in
Table 4. The affected configuration is Temperature Lock-
outs. The default value is OFF. The desired setting is OFF.
To clear the SF39 error manually, reconfigure the Tem-
perature Lockouts option. The SF39 error should be cleared.
NOTE: If the SF error cannot be cleared, replace the moni-
tor thermostat and configure the new thermostat to match
desired settings.
Hardware Failure (HF) Errors — A Hardware Fail-
ure (HF) error is a error that corresponds to a hardware
failure at the monitor thermostat, associated sensors, or zone
damper.
To clear an HF Error, the component responsible for ini-
tiating the HF Error must be adjusted, repaired, or replaced.
See Table 5 for a description of HF errors.
Table 5 — Hardware Failure Errors
ERROR HARDWARE PROBLEMS
ALARM
PRIORITY
HF01 Cannot Detect Closed Damper 2
HF02 Cannot Detect Open Damper 2
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
NOTE: A supply air sensor must be installed or a HF05 error will
occur.
CANNOT DETECT CLOSED DAMPER — An HF01 error
is issued when the thermostat attempts to position the damper
closed, but the position sensor indicates the damper is not at
the full-closed position.
To clear the error, correct the damper problem and use
the Unit Reset function. The Unit Reset function is in
category 7, option 11. The default is OFF. Use the left set
point buttons to set the option to ON. The monitor thermo-
stat will reset all errors.
To correct the damper problem:
1. Check the damper for mechanical binding. An obstruc-
tion in the damper or a bent damper blade can prohibit
the damper from modulating closed. Remove the source
of binding.
2. Check the actuator-to-damper alignment. If the damper
shaft is out of alignment with the actuator crankarm po-
sition, the damper may reach the fully closed position be-
fore the actuator.
Align the damper and the actuator so both fully closed
positions coincide. Prior to alignment, the monitor ther-
mostat Minimum Damper Position (category 3, option 2)
setting should be configured to zero. This will ensure the
actuator will be in the fully closed position when the moni-
tor thermostat demand is zero.
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 configuration of the monitor thermostat Coun-
terclockwise Open option (category 3, option 5). For
Carrier ZD and RD dampers the damper blade modulates
counterclockwise to open. The option must be configured
correctly.
6. 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.
CANNOT DETECT OPEN DAMPER — An HF02 error is
issued when the thermostat attempts to position the damper
open, but the position sensor indicates the damper is at the
full-closed position.
To clear the error, correct the damper problem and use the
Unit Reset function. The Unit Reset function is in category 7,
option 11. The default is OFF. Use the left set point buttons
to set the option to ON. The monitor thermostat will reset all
errors.
To correct the damper problem:
1. For Monitor Only and Construction applications, if the
monitor thermostat displays an HF02, the Scanning Con-
trol option (category 8, option 4) has been improperly con-
figured for operation.
2. Check the damper for mechanical binding. An obstruc-
tion in the damper or a bent damper blade can prohibit
the damper from modulating open. Remove the source of
binding.
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