Viessmann DLFSHBH12XAK Error Codes

Updated October 16, 2026 · by Aurora Star Tech Inc.

Viessmann DLFSHBH12XAK error codes and diagnostic codes. The DLFSHBH12XAK is a Viessmann mini-split in the Viessmann DLFSHB high wall indoor series.

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Viessmann DLFSHBH12XAK error codes list

Code	Meaning	Severity
--	Indoor units mode conflict	Low
AP	Wi-Fi pairing (AP mode)	Low
CL	Filter cleaning reminder / Active Clean	Low
CP	Remote switched off	Low
d1	Demand response signal DR1 received	Low
d2	Demand response signal DR2 received	Low
d3	Demand response signal DR3 received	Low
dE	Demand response input error	Low
dF	Defrost	Low
E-C-O	ECO mode	Low
EC07	Outdoor fan speed out of range	High
EC51	Outdoor EEPROM error	High
EC52	Condenser coil sensor (T3) fault	Medium
EC53	Outdoor ambient sensor (T4) fault	Medium
EC54	Discharge temperature sensor (TP/T5) fault	Medium
EC56	Indoor coil outlet sensor (T2B) fault	Medium
EH0A	Indoor EEPROM error	High
EH0b	Indoor PCB to display board communication error	Medium
EH00	Indoor EEPROM error	High
EH02	Zero-crossing signal error	Medium
EH03	Indoor fan speed out of range	High
EH30	Indoor external fan low voltage	Medium
EH31	Indoor external fan over voltage	Medium
Eh60	Room sensor (T1) fault	Medium
Eh61	Indoor coil sensor (T2) fault	Medium
EL0C	Refrigerant leak detected	High
EL01	Indoor / outdoor communication error	High
FC	Forced cooling	Low
FH 0d	Fault - see outdoor unit	Low
FH 0P	AP mode on / no Wi-Fi kit	Low
FP	Low-temperature heating (8 C mode)	Low
LC01	Speed limited by condenser temperature	Low
LC02	Speed limited by discharge temperature	Low
LC03	Speed limited by current	Low
LC05	Speed limited by voltage	Low
LC06	IPM high temperature / PFC frequency limit	Medium
LH00	Speed limited by indoor coil temperature	Low
LH07	Speed limited by remote	Low
LL	Controls locked	Low
nA	No fault	Low
nF	Filter replacement reminder	Low
Off	Timer off	Low
On	Timer on	Low
PC0A	Condenser high temperature protection	Medium
PC0F	PFC module protection	High
PC0L	Outdoor temperature too low	Low
PC00	Inverter module (IPM) protection	Critical
PC02	Compressor top overheat (OLP)	High
PC03	Pressure protection	High
PC04	Inverter compressor drive error	High
PC06	Discharge temperature protection	High
PC08	Outdoor over-current protection	High
PC10	Low AC supply voltage	High
PC11	AC supply voltage protection (over voltage)	High
PC12	DC bus high voltage / 341 MCE error	High
PC40	Main chip to compressor drive chip communication error	High
PC41	Current input detection protection	Medium
PC42	Compressor start failure	High
PC43	Compressor phase loss	High
PC44	Zero speed protection	High
PC45	Compressor drive chip (IR / 341 PWM) failure	High
PC46	Compressor speed out of control	High
PC49	Compressor over-current	High
PH09	Anti-cold-air in heating	Low
PH90	Evaporator coil too hot	Medium
PH91	Evaporator coil too cold	Medium
SC	Self clean running	Low
SD	Power abnormal detection	Low

Troubleshooting the DLFSHBH12XAK

Indoor unit leaking water All brands · Mini-Split
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Discharge the inverter capacitors before service Viessmann · Mini-Split
Display shows a strange code or does not answer the remote - DLFSHB indoor Viessmann · Mini-Split
Multi-zone: one room heats, another will not cool - DLC multi-zone Viessmann · Mini-Split

All Viessmann Mini-Split error codes →

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General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.

Viessmann DLFSHBH12XAK error codes list

Troubleshooting the DLFSHBH12XAK

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