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