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