Fault Code H4

Fault: Malfunction of low pressure switch (LPS)
Defective low pressure switch
Broken wire
Defective outdoor unit PCB
Defective connector contact
 

For Daikin split and multi-split air conditioning systems included wall-mounted, duct-connected, floor-standing, multi-flow, stylish, european, ururu sarara & cassette-type units.
If molded case circuit breakers or earth leakage circuit breakers have tripped, do not reset the breaker immediately without first checking for any problems with insulation of equipment.
Resetting breakers without a check of insulation may cause damage to equipment.