Daikin GYEQ20AN Service Manual page 172

Flow Charts for Troubleshooting
35
Abnormal Exhaust Temperature
Description Sub-code 0: While the unit is running, the exhaust temperature rises to or above 650°C.
of the failure
Misfire (ignition system failure); mixer failure; fuel gas type setting incorrect; engine oil up; engine oil down;
Possible
causes exhaust temperature sensor failure; engine cooling failure; flammable gas contained in intake air;
of the failure
catalyst failure; harness failure; main circuit board failure
Flow chart
Is Exhaust Temperature Sensor
Operating Normally?
YES
Is Sensor Connected
Properly To Main Circuit
Breaker's Harness?
YES
Is Fuel Gas Type
Setting Correct?
YES
Is Ignition System
Operating Normally?
YES
Is Mixer Operating Normally?
YES
Is Engine Cooling Water
System Operating Normally?
YES
Is Valve Clearance Appropriate?
YES
Is Engine Compression
Pressure Normal?
YES
Is Oil Level Normal?
YES
Is Engine Oil Consumption
Normal?
YES
Check whether engine
suctioned Inflammable Gas.
161
NO
Check Exhaust
Temperature Sensor.
NO
Check Electrical
Wiring System.
NO
Configure Main Circuit Board.
NO
Check Ignition System.
NO
Check Mixer.
See Flow Chart In
NO
"Abnormal Cooling Water
Temperature" Section.
NO
Check Valve Clearance.
NO
Check Engine Compression
Pressure.
NO
Check Oil Level.
NO
Check Oil Consumption.
025902-00E
SiAUY361411EA
Error
L1
code
Troubleshooting