Hitachi YUTAKI Series - Troubleshooting Procedure

175
Troubleshooting procedure
SMGB0066 rev.0 - 12/2009
Troubleshooting
Service Manual
7

 

Upper side
Lower side
(See the following table for details)
 
88
Proceeding Initialization
88
Power ON (During unit stoppage)
U
Pump Operation (During unit stoppage)
U
Waiting of pump feedback (During unit operation)

Stoppage by Thermo-OFF

Heating operation (Normal operation)
↔
Heating operation (Activation of forced compressor frequency control due to low
pressure difference:forced up)
↔
Heating operation (Activation of forced compressor frequency control due to high
pressure difference:forced down)
↔
Heating operation (Activation of forced compressor frequency control due to
excessively high discharge pressure: forced down)
↔
Heating operation (Activation of forced compressor frequency control due to
excessively high current :forced down)
↔
Heating operation (Activation of forced compressor frequency control due to
excessivelyhighinverterntemperature:forceddown)
↔
Retryoperation(byalarm02-91,t1)
↔11
Retry operation (by alarm 02-e1)
↔1
Retry operation (by alarm 02-h1)
↔1
Retryoperation(byalarm51,52,53,54)
↔1
Retryoperation(byalarm04,06)
(Flickering)
Initializing electronic expansion valve

Fan manual operation