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Created page with '=Diagnostic Procedure= 1. Check fuse 3 and that it is live. [[file:Blower_Diagnostic_01.gif|thumbnail|none|Fuse Panel - Fuse 3]] 2. Unplug the 8-pin connector from the rear of …'
=Diagnostic Procedure=
1. Check fuse 3 and that it is live.
[[file:Blower_Diagnostic_01.gif|thumbnail|none|Fuse Panel - Fuse 3]]
2. Unplug the 8-pin connector from the rear of the control panel and check whether pin 2 of the connector is live.
[[file:Blower_Diagnostic_02.gif|thumbnail|none|Test Whether Pin 2 is Live]]
3. Check the wiring between pin 2 of the control panel and fuse 3 for continuity/shorting.
[[file:Blower_Diagnostic_03.gif|thumbnail|none|Check wire between pin 2 and Fuse 3]]
4. Unplug the fan's connector and check the voltage as shown below:
[[file:Blower_Diagnostic_04.gif|thumbnail|none|Fan Connector Voltage]]
* Fan speed 1 should give a reading of 12 V on pin 1 (RD/WH)
* Fan speed 2 should give a reading of 12 V on pin 2 (WH)
* Fan speed 3 should give a reading of 12 V on pin 4 (GN)
* Fan speed 4 should give a reading of 12 V on pin 3 (YE)
Also check whether the resistance across pin 5 and a good grounding point is < 0.1 ohm.
Try fitting a new fan resistor if all readings are correct.
5. Check the voltage on the following pins at the rear of the control panel's 8-pin connector. Readings should be taken with the fan connector unplugged and the control panel connector plugged in.
[[file:Blower_Diagnostic_05.gif|thumbnail|none|Control Panel Voltage]]
* Fan speed 1 should give a reading of 12 V on pin 1
* Fan speed 2 should give a reading of 12 V on pin 7
* Fan speed 3 should give a reading of 12 V on pin 6
* Fan speed 4 should give a reading of 12 V on pin 3 Change the control panel if any reading is incorrect.
6. Check the leads for shorting/continuity if correct readings were obtained when carrying out point 5 but not when carrying out point 4.
[[file:Blower_Diagnostic_06.gif|thumbnail|none|Test Lead Continuity]]
=Related Links=
Replacing the fan resistor
1. Check fuse 3 and that it is live.
[[file:Blower_Diagnostic_01.gif|thumbnail|none|Fuse Panel - Fuse 3]]
2. Unplug the 8-pin connector from the rear of the control panel and check whether pin 2 of the connector is live.
[[file:Blower_Diagnostic_02.gif|thumbnail|none|Test Whether Pin 2 is Live]]
3. Check the wiring between pin 2 of the control panel and fuse 3 for continuity/shorting.
[[file:Blower_Diagnostic_03.gif|thumbnail|none|Check wire between pin 2 and Fuse 3]]
4. Unplug the fan's connector and check the voltage as shown below:
[[file:Blower_Diagnostic_04.gif|thumbnail|none|Fan Connector Voltage]]
* Fan speed 1 should give a reading of 12 V on pin 1 (RD/WH)
* Fan speed 2 should give a reading of 12 V on pin 2 (WH)
* Fan speed 3 should give a reading of 12 V on pin 4 (GN)
* Fan speed 4 should give a reading of 12 V on pin 3 (YE)
Also check whether the resistance across pin 5 and a good grounding point is < 0.1 ohm.
Try fitting a new fan resistor if all readings are correct.
5. Check the voltage on the following pins at the rear of the control panel's 8-pin connector. Readings should be taken with the fan connector unplugged and the control panel connector plugged in.
[[file:Blower_Diagnostic_05.gif|thumbnail|none|Control Panel Voltage]]
* Fan speed 1 should give a reading of 12 V on pin 1
* Fan speed 2 should give a reading of 12 V on pin 7
* Fan speed 3 should give a reading of 12 V on pin 6
* Fan speed 4 should give a reading of 12 V on pin 3 Change the control panel if any reading is incorrect.
6. Check the leads for shorting/continuity if correct readings were obtained when carrying out point 5 but not when carrying out point 4.
[[file:Blower_Diagnostic_06.gif|thumbnail|none|Test Lead Continuity]]
=Related Links=
Replacing the fan resistor
