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[ IX Troubleshooting ]
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HWE09080 GB
1. Error Code
High pressure fault 1 (Heat source unit)
2. Error definition and error detection method
1) If the pressure of 3.78MPa [548psi] or higher is detected by the pressure sensor during operation (the first detection), the heat
source stops once, turns to antirestart mode for 3 minutes, and restarts after 3 minutes automatically.
2) If the pressure of 3.78MPa [548psi] or higher is detected by the pressure sensor again (the second detection) within 30 min-
utes after the first stop of the heat source unit, the heat source unit stops once, turns to anti-restart mode for 3 minutes, and
restarts after 3 minutes automatically.
3) If the pressure of 3.87MPa [561psi] or higher is detected by the pressure sensor (the third detection) within 30 minutes of the
second stop of the heat source unit, the heat source unit will make an error stop, and the error code "1302" will be displayed.
4) If the pressure of 3.78MPa [548psi] or higher is detected more than 30 minutes after the stop of the heat source unit, the de-
tection is regarded as the first detection, and the operation described in step 1 above will start.
5) For 30 minutes after the stop of the heat source unit, preliminary errors will be displayed on the LED display.
6) The heat source unit makes an error stop immediately when not only the pressure sensor but also the pressure switch detects
4.15
+0,-0.15
MPa [601
+0,-22
psi]
3. Cause, check method and remedy
1302
Cause Check method and remedy
(1) Indoor unit LEV actuation failure ĺ Heating Perform a heating operation and check the op-
eration.
Cooling: LEV on the indoor unit
Heat source unit LEV1,2,3
BC controller LEV2a,2b
BC controller SVM1,1b,2,2b
BC controller SVA
Heating: LEV on the indoor unit
BC controller LEV3
BC controller SVM2,2b
BC controller SVB,SV4a - 4d
Refer to the page on troubleshooting for LEV
and solenoid valve.(page 310)
(2) BC controller LEV malfunction Heating only or heating main :
Indoor LEV 3
(3) BC controller SVM1 and 2 malfunction
->Cooling only
(4) BC controller SVA and SVC malfunction
->Cooling only or cooling main
(5) BC controller SVB malfunction ->Heating only or heating main
Solenoid valve SV malfunction 4a-4d ->Cooling only or cooling
main
(6) Heat source unit LEV2a and LEV2b actuation failureĺCooling
(7) Port address setting error. Confirm the port address of the indoor unit.
(8) Refrigerant service valve actuation failure Confirm that the refrigerant service valve is fully
(9) Short cycle on the indoor unit side Check the indoor units for problems and correct
them, if any.
(10) Clogged filter on the indoor unit
(11) Reduced air flow due to dirty fan on the indoor unit fan
(12) Dirty heat exchanger of the indoor unit
(13) Insufficient heat source water flow Check the water heat exchanger for clogging.
Check the heat source water circulation pump.
(14) Heat source water supply cutoff
(15) Dirty or clogged water heat exchanger
Items (13) through (15) above reduce the condensing capabil-
ity of the unit, resulting in high-pressure rise during heating op-
eration.
(16) Solenoid valve (SV1a) malfunction
The by-pass valve (SV1a) can not control rise in high pressure.
Refer to the section on troubleshooting the so-
lenoid valve.(page 308)
(17) Thermistor failure (TH3, TH7) Check the thermistor resistor.(page 260)
(18) Pressure sensor failure Refer to the page on the troubleshooting of the
high pressure sensor. (page 306)
(19) Failure of the thermistor input circuit and pressure sensor input
circuit on the controller board
Check the sensor temperature/pressure on the
LED monitor.
(20) Thermistor mounting problem (TH3, TH7) Check the sensor temperature/pressure on the
LED monitor.
(21) Disconnected male connector on the pressure switch (63H1) or
disconnected wire
(22) Voltage drop caused by unstable power supply voltage Check the input voltage at the power supply ter-
minal TB1.