York IDM030B21E Series, Service Manual

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SM-16005-rev.2
- Table of Contents -
3. Troubleshooting .....................................................................................................................3-1
3.1 Initial Troubleshooting .....................................................................................................................3-2
3.1.1 Checking Electrical Wiring and Power Supply .......................................................................3-2
3.1.2 Location of Printed Circuit Boards (PCBs) ...............................................................................3-6
3.1.3 Checking Rotary Switch and DIP Switch Settings .................................................................3-7
3.1.4 Checking Wired Controller .....................................................................................................3-9
3.1.5 Checking Using 7-Segment Display .........................................................................................3-15
3.1.6 Checking Alarm Code History ..................................................................................................3-15
3.1.7 Emergency Operation ..............................................................................................................3-15
3.2 Troubleshooting Procedures ...........................................................................................................3-16
3.2.1 Alarm Code Table .....................................................................................................................3-17
3.2.2 Troubleshooting Using Alarm Codes ......................................................................................3-18
3.2.3 Abnormalities of Devices ........................................................................................................3-34
3.3 Procedures for Checking .................................................................................................................3-44
3.4 Test Run ..........................................................................................................................................3-44
3.4.1 Test Run Using Wired Controller ............................................................................................3-45
3.4.2 Checking the Test Run ...........................................................................................................3-47
4. Maintenance ..........................................................................................................................4-1
4.1 Maintenance of Outdoor Unit ..........................................................................................................4-2
4.2 Maintenance of Indoor Unit .............................................................................................................4-3
4.2.1 Removing PCB .......................................................................................................................4-3
4.2.2 Removing Fan and Fan Motor ...............................................................................................4-4
4.2.3 Removing Condensate Pump ................................................................................................4-7
4.2.4 Removing Float Switch ..........................................................................................................4-8
4.2.5 Removing Electronic Expansion Valve Coil ...........................................................................4-9
4.2.6 Removing Thermistors for Liquid Pipe and Gas Pipe ............................................................4-10
4.2.7 Removing Condensate Pan ...................................................................................................4-11
4.3 Main Parts .......................................................................................................................................4-12
4.3.1 for Outdoor Unit ......................................................................................................................4-12
4.3.2 for Change-Over Box .............................................................................................................4-12
4.3.3 for Indoor Units .......................................................................................................................4-13
4.3.3.1 Printed Circuit Board .........................................................................................................4-13
4.3.3.2 Fan Motor ..........................................................................................................................4-14
4.3.3.3 Thermistor .........................................................................................................................4-15
4.3.3.4 Electronic Expansion Valve ...............................................................................................4-17