Table of Contents
1. Symptoms that are not malfunctions ....................................................................... I–1
2. Before troubleshooting (W MULTI series) .............................................................. II–1
(1) W MULTI series system overview ................................................................... II–1
(2) About backup operation during maintenance work ..................................... II–2
3. Malfunctions and Displays ...................................................................................... III–1
(1) Malfunctions without any display .................................................................. III–1
(2) Remote Controller alarm display ................................................................... III–2
4. Error Display and Troubleshooting ........................................................................ IV–1
(1) Precautions before Troubleshooting ............................................................. IV–1
(2) About the Error Detection Procedure ............................................................ IV–1
(3) Engine Start Standby ...................................................................................... IV–1
(4) Troubleshooting .............................................................................................. IV–2
A01 Engine Oil Pressure Error ..........................................................................................IV–2
A02 Engine Oil Error ........................................................................................................ IV–4
A03 Engine High-Revolution Error ................................................................................... IV–5
A04 Engine Low-Revolution Error .................................................................................... IV–6
A05 Ignition Source Error .................................................................................................IV–7
A06 Engine Start Failure .................................................................................................. IV–9
A07 Fuel Gas Valve Error ............................................................................................... IV–11
A08 Engine Stall .............................................................................................................IV–12
A10 Exhaust Gas Temperature High ..............................................................................IV–13
A14 Engine Oil Pressure Switch Error ............................................................................IV–14
A15 Starter Power Source Output Short Circuit .............................................................IV–15
A16 Starter Lock .............................................................................................................IV–16
A17 CT Error (Starter Current Detection Failure) ............................................................IV–17
A19 Low Coolant Temperature .......................................................................................IV–18
A20 High Coolant Temperature ......................................................................................IV–19
A21 Coolant Level Error ..................................................................................................IV–21
A22 Coolant Pump Error .................................................................................................IV–23
A23 Crankshaft Angle Sensor Error ...............................................................................IV–24
A24 Camshaft Angle Sensor Error .................................................................................IV–24
A25 Clutch Error .............................................................................................................IV–25
A26 Flameout Error ........................................................................................................IV–26
A27 Catalyst Temperature Error (for only models with catalyst option) ..........................IV–27
A28 Generator Error (for only High Power Multi) ............................................................IV–28
A29 Converter Error (for only High Power Multi) .............................................................IV–29
E01 Remote Controller Receive Failure ......................................................................... IV–30
E02 Remote Controller Transmission Failure ................................................................ IV–33
E03 Indoor Unit Receive Failure from Remote Controller (Central) ............................... IV–34
E04 Indoor Unit Receive Failure from Outdoor Unit ........................................................IV–37
E05 Indoor Unit Transmission Failure to Outdoor Unit ................................................... IV–40
E06 Outdoor Unit Receive Failure from Indoor Unit ........................................................IV–41
GHPtroubleshooting.indb2GHPtroubleshooting.indb2 2012/11/2611:20:012012/11/2611:20:01