Lochinvar Knight Boiler Manual and Troubleshooting Guide
Page 48

Service Manual

3 Troubleshooting

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

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

Sensor Open

 

• Check the sensors and their associated wiring.

(will require a manual

 

Repair or replace the sensor or wiring if damaged.

reset once the condition

Either the inlet water or outlet water

• Measure the resistance of the sensors and compare

has been corrected. Press

temperature sensor has been disconnected.

the resistance to the tables on page

38

of this

the RESET button on the

 

manual.

 

 

display to reset.)

 

 

 

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

 

 

 

Sensor Shorted

 

• Check the sensors and their associated

wiring.

 

Repair or replace the sensor or wiring if damaged.

(will require a manual

 

Either the inlet water or outlet water

• Measure the resistance of the sensors and compare

reset once the condition

has been corrected. Press

temperature sensor has been shorted.

the resistance to the tables on page 38 of this

the RESET button on the

 

manual.

 

 

display to reset.)

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

 

 

Flue Sensor

 

• Check the sensor and its associated wiring. Repair

 

or replace the sensor or wiring if damaged.

 

Open

 

• Measure the resistance of the sensors and compare

(will require a manual

 

The flue sensor has been disconnected or

the resistance to the tables on page 38 of this

reset once the condition

has been corrected. Press

removed from the flue.

manual.

 

 

the RESET button on the

 

• Replace the sensor in flue.

 

 

display to reset.)

 

 

 

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

 

 

 

Flue Sensor

 

• Check the sensor and its associated wiring.

Repair

Shorted

 

or replace the sensor or wiring if damaged.

 

(will require a manual

 

• Measure the resistance of the sensors and compare

reset once the condition

The flue sensor has been shorted.

the resistance to the tables on page 38 of this

has been corrected. Press

the RESET button on the

 

manual.

 

 

display to reset.)

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

 

Sensors equipped with an internal limit (such

• Check the tank temperature.

 

 

Tank Open

as the Lochinvar Squire® Indirect Tank), the

• Repair or replace the sensor wiring if damaged.

 

limit has opened due to temperature (195°F)

• Replace the sensor if necessary.

 

 

 

or the sensor has become disconnected.

 

 

 

 

• Check the wiring connections to switch. Wires should

 

 

be connected to the common and normally open

 

 

terminals.

 

 

 

 

• Remove switch and check for blockage in the orifice.

 

 

• Vent/air intake lengths exceed the maximum allowed

Blower Proving

 

lengths. Refer to Section 2 - General Venting of the

 

Crest Installation and Operation Manual for

Switch Open 1

 

proper lengths.

 

 

(will require a manual

Blower proving pressure switch 1 contacts

• Check for obstruction or blockage in the vent/air

reset once the condition

has been corrected. Press

are open.

intake pipes or at terminations.

 

 

• Inspect the burner. Reference page 34 of this manual

the RESET button on the

 

 

for removal and cleaning procedures.

Replace if

display to reset.)

 

 

necessary.

 

 

 

 

 

 

 

 

• Verify combustion air blower 1 is operating. Replace if

 

 

necessary.

 

 

 

 

• Inspect the heat exchanger. Reference page 35 of

 

 

this manual for removal and cleaning procedures.

 

 

• Faulty pressure switch. Replace switch.

 

 

 

 

 

 

 

48

Page 47 Page 49
Image 48
Page 47 Page 49
Contents Models 1.5 2.0 2.5 3.0 Contents Please read before proceeding Handling ceramic fiber materialsNiosh stated First Aid When servicing boiler What is in this manual? ServiceMaintenance TroubleshootingService Boiler pipingHome Screen Smart Control Module Control inputsControl outputs StripAccess modes General OperationHow the boiler operates How the control modules operateTo adjust and save parameters reference FIG Sequence of operation Sub Parameter Name See Min Max Default User Installer Value AccessParameter table MenuDelay Ramp BMS Setup Setback HWG Night Pumps Initial Setup Viewable and changeable control parametersSet Points Outdoor Reset Ramp Delay Advanced Setup SH/HWG Night Setback ModBus CascadeCascade Offset Minimum On/Off TimePumps Service Notification Service Notification in MonthsService Notification Running Hours Service Notification CyclesService Cascade Screen 8Cascade ScreenGraph Screen 9Graph ScreenParameter SelectionService History Screen 11History ScreenLockout Faults13History ScreenRuntime History Service Screen 14Service ScreenMaintenance Maintenance and annual startup Service technicianOwner maintenance See the Crest User’s Information Manual for InstructionsMaintenance Flue vent system and air piping Check water systemCheck expansion tank Check boiler relief valveCheck ignition ground wiring Check all boiler wiringCheck control settings Check flame signalCleaning boiler heat exchanger Review with ownerTroubleshooting Before troubleshootingCheck the following Check control module fusesTroubleshooting Checking temperature sensors No Pump Low Water Cutoff OpenAnti-cycling Flame FailureIgnition Flame Out Sequence Flame OutRunning Gas Valve / Relay Failure Unit was running and lost the flameAuto Reset Manual ResetHigh Limit High Limit OpenFault Description Corrective Action Louver Proving Sw Open Flue Temp HighDelta T High Outlet TempService Blk Outlet Temp HighRem Ctrl Flt Parameters SavedSwitch Open Sensor OpenSensor Shorted Flue SensorTemperature Burner SupplyDifferential Resets Try Later Internal FaultToo Many Writing toWatch Dog Error No Error StoredWrite EEProm CRC ParametersCombustion Analysis Procedure Gas Valve AdjustmentOr Obstruction Gas Supply PressureGas valve adjustment procedure 2Gas Valve Adjustment Models 1.5Page
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3, 2, 3.5, 2.5, 1.5 specifications

Lochinvar is a leader in manufacturing high-efficiency water heating solutions, and their Lochinvar 1.5, 1.3, and 1.0 models exemplify the company's commitment to innovation and performance. These advanced heating systems are designed to meet the diverse needs of commercial and residential applications, providing reliable hot water while ensuring energy efficiency and environmental sustainability.

The Lochinvar 1.5, 1.3, and 1.0 models incorporate cutting-edge technologies that set them apart from traditional water heaters. One of the most notable features is their use of high-efficiency condensing technology, which extracts maximum heat from the combustion process. This process allows the units to achieve high thermal efficiencies, often exceeding 95%, which not only reduces energy costs but also lowers greenhouse gas emissions.

In terms of design, Lochinvar's models are constructed with durable materials, ensuring longevity and reliability in demanding environments. The stainless steel heat exchanger is a key element that contributes to the durability and performance of the units. This material is resistant to corrosion and scale build-up, enhancing the lifespan of the heater and reducing maintenance requirements.

The Lochinvar 1.5, 1.3, and 1.0 models feature advanced control systems that provide precise temperature management and easy operation. The intuitive digital display allows users to monitor performance metrics, temperature settings, and energy consumption with ease. Additionally, these units are equipped with intelligent modulating gas valves that optimize fuel usage based on demand, ensuring efficient operation across various load conditions.

Safety is a priority in the design of Lochinvar's water heaters. The models come with built-in safety features, including flame failure detection, overheat protection, and venting safeguards. These systems work together to ensure the safe operation of the units, giving users peace of mind.

Another characteristic that makes the Lochinvar 1.5, 1.3, and 1.0 models popular among users is their compact design. These units are engineered to fit in tight spaces, making them ideal for installations where space is at a premium. Despite their small footprint, they deliver powerful performance, ensuring that users have access to the hot water they need.

In summary, Lochinvar's 1.5, 1.3, and 1.0 water heating models represent the pinnacle of efficiency, safety, and reliability. With their advanced technologies, durable construction, and user-friendly features, these units are an excellent choice for anyone seeking a high-performance water heating solution.
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