Hokuetsu AIRMAN PDS185S-6EZ1 Instruction Manual page 35

4. Failure cause and measures
Symptom
Insufficient free air delivery.
Discharge temperature alarm
(A-1).
Discharge temperature error
(E-1) and engine stoppage.
Water temperature alarm
(A-2).
Water temperature error
(E-2) and engine stoppage.
Engine oil pressure error
(E-3) and engine stoppage.
Charge error (A-5).
Discharge temperature sensor
disconnection (E-6) or water
temperature sensor
disconnection (E-7) is
displayed, and engine
stoppage.
Crank case pressure error
(E-9) and engine stoppage.
Engine monitor alarm lamp
glows.
※1. After having found the cause with a service tool, it is necessary to take measures. Therefore,
please contact your nearest distributor.

Contact your nearest dealer if you find it difficult to repair by yourself.

Refer to the engine operation manual for trouble concerning the engine.
Cause
(1) Air filter element clogging.
(2) Unloader valve cannot fully open.
(3) Engine does not reach rated speed.
(1) Oil cooler clogging.
(2) Oil filter clogging.
(3) Faulty discharged air temp. switch.
(4) Loosened or disconnected wiring or
connectors
(5) Belt slippage.
(6) Shortage of compressor oil.
(7) Malfunction of the by-pass valve
(1) Clogged radiator.
(2) Faulty thermostat.
(3) Faulty coolant temp. switch.
(4) Coolant shortage.
(5) Belt slippage.
(6) Loosened or disconnected wiring or
connectors
(1) Engine oil shortage.
(2) Clogged engine oil filter
(3) Faulty oil pressure switch.
(4) Loosened or disconnected wiring or
connectors
(1) Alternator trouble
(2) Abnormality of the charging circuit
(3) Belt loosened and/or cut
(1) Each sensor's wiring/connector
loosen/come off.
(2) Each sensor has error.
(3) Each sensor disconnects.
(1) The freezing of the breather piping
(2) Failure of the crank case internal
pressure switch.
(1) Engine in trouble
4-4
Countermeasures
Clean or change of
element
Call your nearest dealer
(See 4-3)
Clean
Change
Change
Check/Fasten
Re-adjust tension
Replenish compressor oil
Check /Change
Clean
Change
Change
Replenish
Re-adjust tension
Check/Fasten
Replenish engine oil
Change
Change
Check/retighten
Check or change of
alternator
Check of the electrical
system (charging circuit)
Change
Check/Fasten
Disassemble/Check
Repair and replace
Defrost the piping with a
heater, etc.
Change
※1