Hardware Failure (Hf) Errors - Carrier 33CS Installation, Service And Instructions

EXAMPLE OF CLEARING AN SF ERROR — The zone
controller displays a SF20 error. Look up SF20 in Table 3.
The affected configuration is Minimum Damper Position. The
default value is 5. The desired setting is 3.
To clear the SF20 error manually, reconfigure the Mini-
mum Damper Position option to 3. The SF20 error should
be cleared.
NOTE: If the SF error cannot be cleared, replace the bypass
controller and configure the new bypass controller to match
desired settings.

Hardware Failure (HF) Errors

ure (HF) error is an error that corresponds to a hardware fail-
ure at the bypass controller, associated sensors, or zone damper.
To clear a HF Error, the component responsible for ini-
tiating the HF Error must be adjusted, repaired, or replaced.
See Table 4 for a description of HF errors.
Table 4 – Hardware Failure Errors
ERROR ERROR DESCRIPTION
HF01 Cannot Detect Closed Damper
HF02 Cannot Detect Open Damper
HF03 Zone Temperature Sensor Out of Range
HF04 Remote Room Sensor Out of Range
HF05 Duct Temperature Sensor Out of Range
HF06 Hardware NOVRAM Failure
HF07 Hardware Analog/Digital Failure
HF08 Pressure Sensor Out of Range
CANNOT DETECT CLOSED DAMPER — An HF01 error
is issued when the bypass controller attempts to close the
damper, but the position sensor indicates the damper is not
at the fully 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 3. The default is OFF. Use the left set
point buttons to set the option to ON. The bypass controller
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 crank arm 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 Minimum Damper
Position (category 3, option 2) setting should be config-
ured to zero. This will ensure the actuator will be in the
fully closed position when the zone controller 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 fully open or fully closed position, use the
following steps to correct the problem:
a. Disconnect the bypass controller ribbon cable from the
wiring connector 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 fully closed and
fully open positions.
c. Reconnect the bypass controller.
— A Hardware Fail-
ALARM
PRIORITY
2
2
2
2
2
2
2
2
16
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 zone controller Counter-
clockwise Open option (category 3, option 8). For
Carrier ZD and RD dampers the damper blade modulates
counterclockwise to open. Ensure this option is config-
ured correctly.
6. Check the wiring between the damper actuator and by-
pass controller. If the green wire between the damper ac-
tuator and the bypass controller has lost continuity, the
bypass controller will constantly receive the indication
that the damper is fully closed.
To check the wiring, disconnect the bypass controller and
wiring connector board. Connect the bypass controller and
wiring connector board directly at the damper board. If
the error disappears, the field wiring or the connections
should be checked. Check the continuity of the green wire.
If the error is still present, the bypass controller 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 bypass controller attempts to open the damper,
but the position sensor indicates the damper is at the fully
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 3. The default is OFF. Use the left set point buttons
to set the option to ON. The bypass controller 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 open. Remove the source of
binding.
2. Check the damper actuator position to see if the traveler
arm has moved past the position sensor. If the traveler
arm is stuck at fully open or fully closed position, use the
following steps to correct the problem:
a. Disconnect the bypass controller ribbon strip from the
wiring connector 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 fully closed and
fully open positions.
c. Reconnect the bypass controller.
3. 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.
4. Check the wiring between the damper actuator and by-
pass controller. If the green wire between the damper ac-
tuator and the bypass controller has lost continuity, the
bypass controller will constantly receive the indication
that the damper is fully closed.