Mitsubishi Electric e Series Service Handbook page 125

[ IX Troubleshooting ]
Error
Error type
code *1
Discharge temperature fault
(A discharge refrigerant temperature of 120ºC or
above is detected momentarily while the compressor
1102
is in operation.)
101: MAIN circuit
102: SUB circuit
Hot water abnormal rise
1138
Cold water abnormal drop
1503
Gas leak fault
1510
Low evaporation temperature fault
1512
101: MAIN circuit
102: SUB circuit
426* Cooling fan fault
Fan interlock fault
4122
Inverter IPM error
error
425*
(101)
425* ACCT overcurrent
(102)
425* Overcurrent relay trip (effective value)
(During operation)
(107)
425* Overcurrent relay trip (momentary value)
(During operation)
(106)
Short-circuited IPM/ground fault
425*
(During operation)
(104)
Overcurrent error due to a short-circuited
425*
(During operation)
(105)
425*
Fan motor stepping out error
(137)
Voltage Bus voltage drop protection
422*
related
(108)
problems
during
422*
Bus voltage rise protection
operation
(109)
Logic error
422*
(111)
Control power supply error
422*
(129)
422* Inverter bus voltage faul
(131)
Heatsink fault
423*
(Heatsink overheat protection)
(125)
Overload protection
424*
ACCT sensor fault
530*
(115)
HWE20010
Cause
(Installation/Setting error)
No water
Abrupt change in water temperature
(5K/min. or greater)
Pump failure
Drop in water flow or water supply
cutoff
Water temperature rise
4 * Drop in water flow or water supply
cutoff
Water temperature drop
-
Drop in water flow
Water temperature drop
-
Disconnection of wiring
-
-
-
-
-
Inter-phase voltage drop
Fan motor stepping out
Momentary power failure/power
failure
Power supply voltage drop
Incorrect power supply voltag
Malfunction due to external noise
interference
• Faulty grounding
• Improper transmission and
external wiring installation
(Shielded cable is not used.)
• Low-voltage signal wire and high-
voltage wire are in contact.
(Placing the signal wire and power
wire in the same conduit)
Control power supply failure
Power supply voltage dro
Power supply voltage drop
Clogged heatsink cooling air passage
Clogged heatsink cooling air passage
Power supply voltage drop
-
- 116 -
Cause
(Parts problems)
• High-pressure sensor fault
• Linear expansion valve fault
• Refrigerant deficiency (refrigerant gas
leak)
-
-
• High pressure sensor fault
• Refrigerant deficiency
(refrigerant gas leak)
-
• Cooling fan fault
• Fan motor fault
• FANCONT board fault
• INV board, Fan INV board fault
• Ground fault of the compressor
• Coil problem
• IPM error (loose terminal screws,
cracked due to swelling)
• Items listed under "Heatsink overheat
protection" below
• INV board fault
• Ground fault of the compressor
• Coil problem
• IPM error (loose terminal screws,
cracked due to swelling)
• INV board, Fan INV board fault
• Ground fault of the compressor
• IPM error (loose terminal screws,
cracked due to swelling)
• INV board, Fan INV board fault
• Ground fault of the compressor
• Shorted output wiring
• Fan motor fault
• Fan INV board, wiring fault
• INV board fault
• 72C fault
• R1, R5 fault
• INV board fault
• INV board, Fan INV board fault
• INV board, main board fault
• Broken wiring between INV and main
control board
• MAIN board fault
• Power supply voltage drop
• Cooling fan fault
• INV board fault
• IPM error (loose terminal screws,
cracked due to swelling)
• Cooling fan fault
• Current sensor fault
• INV circuit fault
• Compressor fault
• INV board fault
• Ground fault of the compressor and IPM
error
Error reset *2
Operation SW
Selector Remote
switch controller
GB