Troubleshooting Procedure - Hitachi YUTAKI Series Service Manual

Troubleshooting
Service Manual

7.2. TroUBlESHooTInG ProCEdUrE

● Checking using the 7-segment display.
7-seg. display info.
General Indication
88
88
U
U


↔
↔
↔
↔
↔
↔
↔11
↔1
↔1
↔1

(Flickering)

Upper side
Lower side
(See the following table for details)
Proceeding Initialization
Power ON (During unit stoppage)
Pump Operation (During unit stoppage)
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 fin temperature: forced down)
Retry operation (by alarm 02-91, t1)
Retry operation (by alarm 02-e1)
Retry operation (by alarm 02-h1)
Retry operation (by alarm 51, 52, 53, 54)
Retry operation (by alarm 04, 06)
Initializing electronic expansion valve
Fan manual operation
Content
SMGB0066 rev.0 - 12/2009

Troubleshooting procedure

7
175