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Troubleshooting
Service manual
32
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Trigger
Effect
Reset
Low pressure control (by
sensor) active due to
<safety value certain
times within certain
minutes, see
Unit will stop operating.
Manual reset via user
interface.
Automatic Reset when
Low Pressure >reset
value, see
449].
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Check that all stop valves of the refrigerant circuit are open. See
363].
Possible cause:
Closed stop valve in the refrigerant circuit.
2
Perform a cross‑wiring check of the F1‑F2 transmission wiring between the
indoor units and outdoor unit. Set field setting 2‑5 of the outdoor unit to 1 to
start the indoor units connected to that outdoor unit on forced fan operation,
see
455]. If any other indoor unit (that should be
connected to a different outdoor unit) is operating, this indoor unit is
connected to the wrong outdoor unit (cross‑wired). Correct the wiring
between the indoor unit(s) and outdoor unit.
Possible cause:
F1‑F2 transmission wiring is cross‑wired with another outdoor
unit system.
3
Check if the refrigerant circuit is correctly charged. See
363].
Possible cause:
Refrigerant shortage.
4
Check for the presence of humidity in the refrigerant circuit. See
363].
Possible cause:
Humidity in the refrigerant circuit.
5
Check if the refrigerant circuit is clogged. See
363].
Possible cause:
Clogged refrigerant circuit.
6
Perform a check of the evaporator side expansion valve. See
244].
Possible cause:
Faulty evaporator side expansion valve.
7
Check the required space around the outdoor unit heat exchanger. See
Possible cause:
Insufficient air flow or air by‑pass due to required space
specifications not met.
8
Clean the outdoor heat exchanger. See
Possible cause:
Dirty outdoor heat exchanger.
9
Perform a check of the refrigerant low pressure sensor. See
Possible cause:
Faulty refrigerant low pressure sensor.
10
Perform a check of the main PCB. See
Possible cause:
Faulty main PCB.
Summary of Contents for VRV IV+
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