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Lochinvar 400 - 801 Outlet Temp High (continued), Service Blk, Rem Ctrl Flt , Parameters Progr

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3 Troubleshooting

Service Manual

42

Table 3-4 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT DESCRIPTION CORRECTIVE ACTION

Outlet TempHigh(continued)

Outlet water temperature has exceeded the

maximum outlet water temperature.

• Verify that the boiler pump is set to the proper speed

or that the boiler pump is the proper size. Reference

Section 6 - Hydronic Piping of the Knight XL

Installation and Operation Manual for boiler pump

specifications.

• Replace the main control board.

Rem Ctrl Flt External control is cycling too often.

• Check set point of the external control.

• Check the wiring between the external control and the

unit.

• Replace the control.

ParametersProgr

(will require a manual

reset once the condition

has been corrected. Press

the RESET button on the

SMART SYSTEM display

to reset.)

After downloading parameters from a laptop,

the main control board must be reset.

• Press the ENTER/RESET button on the SMART

SYSTEM display panel.

Service Blk

While the unit is in Service Mode, the outlet

temperature has exceeded 185°F.

• Establish a heating load to remove the heat from the

boiler loop.

• Verify that the system is full of water and that all air

has been properly purged from the system.

• Verify that the boiler is piped properly into the heating

system. Refer to Section 6 - Hydronic Piping of the

Knight XL Installation and Operation Manual for the

proper piping methods for the Knight XL boiler.

• Check 120 vac to the boiler pump motor on a call for

heat. If voltage is not present, check the wiring back

to the main control board. Replace the main control

board if necessary.

• If 120 vac is present on a call for heat and the boiler

pump is not operating, replace the pump.

• Verify that the boiler pump is set to the proper speed

or that the boiler pump is the proper size. Reference

Section 6 - Hydronic Piping of the Knight

XL Installation and Operation Manual for boiler

pump specifications.

Contents

Main Service Manual Models: 400 - 801 WARNING Hazard definitions Contents DANGER WARNING CAUTION CAUTION NOTICE Please read before proceeding Handling ceramic fiber materials REMOVAL OF COMBUSTION CHAMBER LINING NIOSH stated First Aid. Please read before proceeding When servicing boiler Boiler operation Boiler water Freeze protection fluids What is in this manual? Service Near boiler piping The Knight XL display Control module inputs Near boiler piping NAVIGATION DIAL The Knight XL display LOW VOLTAGE CONNECTION BOARD SMART CONTROL MODULE Control inputs LOW VOLTAGE CONNECTION BOARD SMART CONTROL MODULE Control outputs General Operation How the boiler operates How the control module operates Sequence of operation Access modes OPERATION DISPLAY Table 1-1 (continued from previous page) Sequence of Operation Display panel menu access Display panel parameter access Table 1-4 This table lists SMART SYSTEM control module parameters and where to access them A B C D TEMPERATURE SETTINGS DATA E OUTDOOR RESET F G CIRCULATION PUMPS I H J K Viewable and changeable control parameters A: General NOTICE C: Data Logging D: Functions B: Temperature Settings E: DHW Settings F: Outdoor Reset G: Anti-Cycling H: Control modes Cascade Offset Minimum On/Off Time J: BMS I: Circulation pumps K: Service Notification Maintenance and annual startup Service technician Owner maintenance 2 Address reported problems Check all piping for leaks Inspect boiler area Inspect boiler interior Flue vent system and air piping Check water system Check expansion tank Check boiler relief valve 2 Inspect ignition and flame sense electrodes Check ignition ground wiring Check all boiler wiring Check control settings Check flame signal Review with owner Cleaning boiler heat exchanger Before troubleshooting: Check the following: Check control module fuses Table 3-1 Troubleshooting Chart - No Display FAULT CAUSE CORRECTIVE ACTION No Display No Burner Operation Unit Does Not Modulate Above 50% Checking temperature sensors S1a S3a FAULT CAUSE CORRECTIVE ACTION Table 3-4 Troubleshooting Chart - Fault Messages Displayed on Boiler Interface Gas Pressure SW Flow Switch/LWCO Blocked Drain SW APS Open Anti-cycling Flame Fail Ign Flame Sequence Auto Reset High Limit Fan Low OR Fan Speed Low GV/Relay Fail Fan High OR Fan Speed High Sensor Open Sensor Shorted Louver Proving Sw Flue Temp High Delta T High Outlet Temp High Outlet Temp High (continued) Service Blk Rem Ctrl Flt Parameters Progr Page Combustion Analysis Procedure POSSIBLE CAUSE CORRECTIVE ACTION Gas valve adjustment procedure Model 501 Model 400 Models 601 - 801