Rror Messages - Dometic Blizzard Turbo Installation And Operation Manual

OPERATING THE SYSTEM WITH QT CONTROLS
F S
AULT HUTDOWNS AND
When power is lost, the system will begin operating in the previous mode prior to power loss. All program values are retained in
a non-volatile memory.
The Qt Control/Display contains built-in safeguards designed to protect the air conditioning system from damaging conditions. If
an operational failure occurs, the Qt Control/Display will flash one of the following code messages. Fault or error code displays
are cancelled by pressing the MODE key. (See Table 3 and Table 4.)
NOTE 1: If user selects HEAT or COOL mode, unit will operate and the display will flash "Error Code" until the MODE
key is pressed. After the MODE key is pressed, display will show steady "—" until fault is corrected.
If user selects AUTO mode, unit will shut down until MODE key is pressed. Display will show "—" and unit will run.
NOTE 2: If an "Error Code" is displayed, the MODE key may be pressed to continue operating the unit until the sensor
is repaired. Fault code shutdown must be corrected before operation is allowed to continue.
Table 3: FAULT CODE CHART
FAULT CODE DISPLAY
"LO" then "AC"
"HI" then "AC"
"LO" then "FC"
"HI" then "FC"
"HI" then "PS"
"HI" then "—"
Table 4: ERROR CODE CHART
ERROR CODE DISPLAY
"IS" then "—"
"CS" then "—"
(ignore during heating mode)
"—" (steady)
"LO" then "ES"
"ES" then "—"
22
E M
RROR ESSAGES
MODES
Low voltage shutdown
High voltage shutdown
Low frequency shutdown
High frequency shutdown
High pressure shutdown
(compressor running)
High pressure shutdown
(compressor off)
MODES
Internal temperature sensor error
Compressor discharge temperature
sensor fail
Mode button has been pressed to
run unit after an "Error Code."
Evaporator sensor shutdown
Evaporator temperature sensor
Tur
Blizzard bo Split System Manual
COMMENT
See AC line voltage calibration section
See AC line voltage calibration section
Incoming frequency < 57 Hz. Adjust power
source output frequency to 60 Hz with unit
operating in COOL mode.
Incoming frequency > 63 Hz. Adjust power
source output frequency to 60 Hz with unit
operating in COOL mode.
Head pressure above 425 psi during cooling
operation. Check to see if condenser fan is
operating properly.
High pressure switch or wiring has "failed open"
during cooling operation. Replace high pressure
switch or check high pressure switch wiring for
an "open circuit."
COMMENT
Replace internal temperature sensor with cable.
See note 1 above.
Replace compressor discharge temperature
sensor and cable. See note 1 above.
Unit running after a sensor failure. See note 2
above.
Shutdown due to evaporator icing in COOL
mode. Evaporator sensor temperature < 34°F.
De-ice the evaporator by running the internal fan
only in manual mode.
Failed or shorted evaporator temperature
sensor. Replace evaporator temperature sensor
and cable. See note 1 above.
L-3448 ENGLISH