Haier MRVIII-S AV08NMSETA Design, Installation & Maintenance Instruction page 77

When there is no failure, if the starting condition can not be met, digital tube on master unit will
display stand-by code:
Standby state of capacity over-
555
match
Outdoor ambient temperature too
555.1
high (heating)
Outdoor ambient temperature too
555.3
high or too low (cooling)
555.4 Crankcase heater working
When capacity is over 130% or low-
er than 50%, the system is standby.
Ta>27℃ , Standby
Ta>54℃ or Ta<-10℃ , Standby
Oil temperature is too low
77
Resumable