Table of contents (continued) – LAARS NeoTherm NTV (Sizes 150–285 MBTU/h) - Service Manual User Manual
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Service Manual NeoTherm 80 - NeoTherm 285
Table of Contents (continued)
Checking the Air Pressure Switch -
Blower Proving Switch ....................................................... 33
Test Procedure for Air Pressure Switch ............................. 34
Removing and Replacing the Air Pressure Switch ............ 34
Checking the Blower .......................................................... 36
Removing and Replacing the Blower ................................ 37
High Stack Temperature Fault ........................................... 40
Stack Temperature Limit Switch ........................................ 41
Checking the System Sensor ............................................ 42
Checking the DHW Sensor ................................................ 42
Inlet Water Temperature Sensor ........................................ 43
Inlet Water Temperature Sensor ........................................ 43
Outlet Water Temperature Sensor ..................................... 44
Outlet Water Temperature Sensor .................................... 44
Testing the Temperature Sensors ...................................... 45
Troubleshooting the Outdoor Reset System ..................... 46
Servicing the Transformer ................................................. 46
Removing and Replacing the Pressure Relief Valve ......... 48
Ignitor Assembly ................................................................ 49
Flame Sensor .................................................................... 50
Pump Fault ........................................................................ 51
Section C - Possible Combustion Problems
Sect. Title
Page
About Correct Combustion ................................................ 53
Combustion Adjustment Procedure -
Units with Original (White) User Interface ......................... 54
Combustion Adjustment Procedure -
Units with Current User Interface ...................................... 56
Troubleshooting Combustion Problems ............................ 58
Cleaning the Burner and Heat Exchanger ......................... 59
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