Carrier 33CS Installation, Service And Instructions page 17

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.
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.
ZONE TEMPERATURE SENSOR OUT OF RANGE — An
HF03 error is issued when the zone temperature sensor is
open or shorted. The HF03 error will automatically clear when
the sensor reading is back within the allowable range. The
zone temperature sensor can be recalibrated.
To check the zone temperature sensor:
1. Ensure the Room Sensor option (category 5, option 1)
has been configured correctly. Check for other wiring run-
ning parallel to and less than 12 in. from the remote room
sensor wiring. Avoid running AC, control, or communi-
cation bus wiring near the remote room sensor wiring.
Maintain a minimum separation of 12 in. or more be-
tween other wiring and remote room sensor wiring. Make
sure that the legs zone temperature sensor are not shorted
out.
2. Check the zone temperature sensor calibration. Calibrate
the sensor by manual calibration at the bypass controller
using the Zone Temperature Sensor Calibration function
(category 5, option 2) and an accurate thermometer. Mea-
sure the temperature at the bypass controller zone tem-
perature 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.
REMOTE ROOM SENSOR OUT OF RANGE — An HF04
error is issued when the remote room temperature sensor is
open or shorted. The HF04 error will automatically clear when
the sensor reading is back within the allowable range. The
remote room temperature sensor can be recalibrated.
To check the remote room sensor:
1. If using a remote room temperature sensor, check for proper
wiring connections (red to +, black to -). Check if the
remote room sensor wiring and connections to the circuit
board are physically intact. Maintain a minimum sepa-
ration 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 bypass controller
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.
3. Check the configuration of the remote room sensor.
DUCT TEMPERATURE SENSOR OUT OF RANGE — An
HF05 error is issued when the duct temperature sensor is
open or shorted. The HF05 error will automatically clear when
the sensor reading is back within the allowable range. The
duct temperature sensor can be recalibrated.
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 5-conductor control wiring run-
ning between the damper actuator and the zone controller
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 bypass controller
using the Duct Temperature Sensor Calibration function
(category 5, option 4) and an accurate thermometer. Mea-
sure the temperature at the duct temperature sensor lo-
cation 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 bypass controller detects a problem in its
non-volatile memory. If the bypass controller is able to cor-
rect the problem, the error will clear in approximately
10 minutes. If the condition persists, the bypass controller
must be replaced.
HARDWARE A/D FAILURE — An HF07 error is issued
when the bypass controller detects a problem with its analog/
digital converter circuitry. If the bypass controller is able to
correct the problem, the error will clear in approximately
10 minutes. If the condition persists, the bypass controller
must be replaced.
PRESSURE SENSOR OUT OF RANGE — An HF08 error
is issued when the pressure sensor is open or shorted. The
pressure sensor can be recalibrated. The HF08 error will au-
tomatically clear when the sensor reading is back within the
allowable range.
To clear the HF08 error:
1. Check for excessive static pressure or excessive differ-
ential pressure at the PS sensor pressure pickup. The
33CSPS-01 is rated for a maximum of 0.5 in. wg. The
33CSPS-02 is rated for a maximum of 2.0 in. wg. When
the pressure sensor is operating at or above the rated pres-
sure, the sensor readings will be unstable, causing an HF08
error.
2. Check the connection of hoses running from the PSP pres-
sure pickup and the PS pressure sensor. Incorrect or faulty
connections with the PSP pressure pickup can result in an
HF08 error.
3. Check to ensure the PS pressure sensor wiring connec-
tion to the damper actuator is complete and well con-
nected. Ensure the connections labeled "O" on the PS
pressure sensor wiring harness are not used or shorted to
ground. For the bypass controller, the two wires marked
"O" on the PS pressure sensor wiring harness are not used
and can be clipped to prevent possible connection to ground.
17