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Error Codes

Error codes represent different faults in commercial VRF System. This page is only for non-VRF, if you have error code related to VRF, please email to info@tosot.com for consultation.

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CODE

Compressor high pressure protection

Solution

b5

Liquid valve temperature sensor error

Solution

b7

Gas valve temperature sensor error

Solution

C5

Malfunction protection of jumper cap

Solution

dd

Detection status of wrong connection of communication wire or malfunction of electronic expansion valve

Solution

dn

Wrong connection of communication wire or malfunction of electronic expansion valve

Solution

E1

Compressor high pressure protection

Solution

E2

Anti-freezing rotection for evaporator

Solution

E3

Compressor low pressure protection

Solution

E4

High discharge temperature protection of compressor

Solution

E5

Whole unit overcurrent protection

Solution

E6

Communication malfunction

Solution

E7

Mode conflict

Solution

E8

High temperature and Overload protection

Solution

E9

Cold air prevention protection

Solution

EE

ODU memory chip error

Solution

ee

Drive memory chip error

Solution

EU

Limit/decrease frequency due to high temperature of module

Solution

F0

Refrigerant lacking or blockage protection of system 

Solution

F1

Indoor ambient temperature sensor error

Solution

F2

Indoor evaporator temperature sensor error

Solution

F3

Outdoor ambient temperature sensor error

Solution

F4

Outdoor condenser temperature sensor error

Solution

F5

Outdoor discharge temperature sensor error

Solution

F6

Limit/decrease frequency due to overload

Solution

F8

Decrease frequency due to overcurrent

Solution

F9

Decrease frequency due to high air discharge

Solution

FH

Limit/decrease frequency due to antifreezing

Solution

Fo

Refrigerant recycling mode

Solution

H1

Defrosting or oil return in heating mode

Solution

H3

Compressor overload protection

Solution

H4

Overload or overtemperature protection

Solution

H5

IPM modular protection

Solution

H6

Internal motor (fan motor) do not operate

Solution

H7

Compressor desynchronizing

Solution

HC

PFC protection

Solution

HE

Compressor demagnetization protection

Solution

JF

Malfunction of detecting plate(WIFI )

Solution

L3

Outdoor DC fan motor malfunction

Solution

L9

Power protection

Solution

LC

Start failure of compressor

Solution

Lc

Start failure of compressor

Solution

Ld

Compressor phase-lacking/phase-inverse protection

Solution

LP

Indoor unit and outdoor unit doesn't match

Solution

oE

PFC module temperature protection

Solution

P0

Compressor Min frequence in test state

Solution

P1

Compressor rated frequence in test state

Solution

P2

Compressor maximum frequence in test state

Solution

P3

Compressor intermediate frequence in test state

Solution

P5

Compressor phase current protection

Solution

P6

Master control and driver communication error

Solution

P7

Driver module sensor error

Solution

P8

Driver module temperature is too high

Solution

PA

AC current protection

Solution

Pc

Driver current error

Solution

PH

DC bus-bar high voltage protection

Solution

PL

DC bus-bar low voltage protection

Solution

PU

Capacitor or Charge loop error

Solution

U1

Malfunction of phase current detection circuit for compressor

Solution

U3

Malfunction of voltage dropping for DC bus-bar

Solution

U5

Malfunction of complete unit's current detection

Solution

U7

The four-way valve is abnormal

Solution

U8

Malfunction of zero-cross detection circuit

Solution
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