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Lochinvar
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Boiler
Lochinvar
400 - 801 service manual
Models:
400 - 801
1
47
48
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48 pages
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Troubleshooting
Maintenance
Check ignition ground wiring
Reset
Combustion Analysis Procedure
Watch Dog Error
SH Ramp Delay
Check flame signal
Settings
Temperature units C / F
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NOTES
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Contents
Models 400
Contents
Niosh stated First Aid
Please read before proceeding
Handling ceramic fiber materials
When servicing boiler
Troubleshooting
What is in this manual?
Service
Maintenance
Near boiler piping
Service
Navigation Dial
Knight XL display
LOW Voltage Connection Board
Control inputs
Control outputs
Smart Control Module
How the control module operates
Access modes
General Operation
How the boiler operates
Operation Display
From previous page Sequence of Operation
Button Screen Operation Display Status
Display panel menu access
Display panel parameter access
General
Parameter table
Settings
Reset
Notification
Software Version
Temperature units C / F
Viewable and changeable control parameters
Date and Time
Functions
Temperature Settings
Data Logging
DHW Settings
Outdoor Reset
Anti-Cycling
BMS Thermostat Input Active / Inactive
SH Ramp Delay
Control modes
Controlling Sensor
Minimum On/Off Time
Cascade Offset
Circulation pumps
Service Notification
Owner maintenance
Maintenance Maintenance and annual startup
Service technician
Maintenance
Check boiler relief valve
Flue vent system and air piping
Check water system
Check expansion tank
Inspect ignition and flame sense electrodes
Check ignition ground wiring
Check all boiler wiring
Check control settings
Model Kit Part Component Number Description
Check flame signal
Cleaning boiler heat exchanger
Review with owner
Check the following
Troubleshooting
Before troubleshooting
Check control module fuses
Unit Does Not
No Display
No Burner
Operation
Resistance Temperature
Checking temperature sensors
Temperature Resistance
Wire Color R/BK and Y Wire Color G and Y
DHW Pump
Noisy
No Pump
Boiler Pump System Pump
Flow
Switch/LWCO
Flame Fail Ign
Anti-cycling
Fan Low
Auto Reset
Flame Sequence
High Limit
Fan Speed High
GV/Relay
Fail
Fan High
High
Flue Temp High
Delta T High
Outlet Temp
Parameters Progr
Service Blk
Rem Ctrl Flt
Write EEProm
Watch Dog Error
No Error Stored
Low 24 vac
Gas Supply Pressure
Combustion Analysis Procedure
Gas Valve Adjustment
Or Obstruction
Models 601
Gas valve adjustment procedure
Model
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