Lochinvar 1.5, 3.5, 2.5 service manual Low Water, Cutoff Open

Page 40

Service Manual

3 Troubleshooting

Table 3G Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

Gas Pressure SW

 

• Measure the supply gas pressure to determine cause

Open

 

of failure. Natural and LP gas pressures should be

(will require a manual

Either the low gas pressure switch or one of

between 4 - 14 inches w.c. (1.0 - 3.5 kPa).

 

 

reset once the condition

• Refer

to Section 6 - Gas Connections of

the

has been corrected. Press

the high gas pressure switches tripped.

Crest Installation and Operation Manual for detailed

the RESET button on the

 

 

information concerning the gas supply.

 

 

 

SMART TOUCH display

 

 

 

 

 

• Correct the supply gas pressure if necessary.

 

to reset.)

 

 

 

 

 

 

 

• Reset the LWCO from the RESET button on the front

Low Water

 

control panel.

 

 

 

 

 

 

 

 

 

 

 

 

 

Cutoff Open

The low water cutoff is not making.

• Verify system is full of water and all air has been

(will require a manual

purged from the system.

 

 

 

 

 

 

 

 

 

reset once condition has

 

• Check for loose or misplaced jumpers if flow switch or

been corrected. Press

 

 

LWCO is not installed.

 

 

 

 

the RESET button on the

 

 

 

 

 

 

 

 

 

 

 

 

 

SMART TOUCH display

 

 

 

 

 

 

 

 

 

• Replace fuse F2 on the control board, see page 38

to reset.)

Blown fuse.

 

of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Blocked Drain SW

 

• Check condensate tube from unit to floor drain for

Open

 

proper installation and obstructions.

 

 

 

(will require a manual

The blocked drain switch has detected

• Inspect

condensate

trap

for blockage.

Clean if

reset once condition has

necessary.

 

 

 

 

 

been corrected. Press

excessive condensate build up inside the

• Check for loose wiring connection at wire harness

the RESET button on the

unit.

SMART TOUCH display

 

plug.

 

 

 

 

 

 

to reset.)

 

• Bad blocked drain switch. Replace switch.

 

 

 

 

 

 

 

• Check the wiring connections to switch. Wires should

 

 

be connected to the common and normally closed

 

 

terminals.

 

 

 

 

 

 

 

• Vent/air intake lengths exceed the maximum allowed

 

 

lengths. Refer to Section 2 - General Venting of the

 

 

Crest

Installation

and

Operation

Manual

for

APS

 

proper lengths.

 

 

 

 

 

 

• Check

for obstruction or

blockage in

the

vent/air

Open

 

 

intake pipes or at terminations.

 

 

 

(will require a manual

 

 

 

 

Blocked flue/inlet pressure switch contacts

• Check reference hose and tubing connected to the

reset once the condition

has been corrected. Press

are open.

pressure switch for blockage or obstruction.

 

 

the RESET button on the

 

• Inspect the burner. Reference page 34 of this manual

SMART TOUCH display

 

for removal and cleaning

procedures.

Replace if

to reset.)

 

necessary.

 

 

 

 

 

 

 

• Inspect the heat exchanger. Reference page 35 of

 

 

this manual for removal and cleaning procedures.

 

 

Replace if necessary.

 

 

 

 

 

 

 

• Faulty air pressure switch. Replace switch.

 

 

 

 

• Verify combustion air blower is operating. Replace if

 

 

necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

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Page 39 Page 41
Contents Models 1.5 2.0 2.5 3.0 Contents Handling ceramic fiber materials Please read before proceedingNiosh 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 Viewable and changeable control parameters Initial SetupSet 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 OpenFlame Failure Anti-cyclingIgnition Flame Out Flame Out SequenceRunning 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 SensorBurner Supply TemperatureDifferential 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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