H3 Compressor Overload Protection; H4 Overload - Toyotomi KURO Mini Service Manual

TOYOTOMI
3.4.17 ―H3‖ Compressor Overload Protection
Error display: ODU mainboard, IDU wired control and IDU receiver light board will display
Error judgment condition and method:
When the mainboard's interface ovc-comp is broken off for 3s, error H3 will be reported.
Possible reason:
■The interface ovc-comp is not short-circuited.
■ODU mainboard is damaged.
Troubleshooting：
3.4.18 ―H4‖ Overload
Error display: ODU mainboard, IDU wired control and IDU receiver light board will display
Error judgment condition and method:
When tube temperature is higher than the protection value, system will report overload protection.
Possible reason:
■Cooling ODU heat exchanger is blocked or heat exchange is bad.
■Heating IDU heat exchanger is blocked or heat exchange is bad.
■Operating temperature is too high.
■System charging quantity is too much.
H3 compressor overload
protection compressor overload
protection
Check if the over comp. interface on the
mainboard is connection
YES
Replace the
mainboard
U-Match 5 SERIES UNIT SERVICE MANUAL
NO
Connection the over
comp. interface
56
H3
H4