Service Manual

3 Troubleshooting (continued)

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

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

 

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

 

 

 

or that the boiler pump is the proper size. Reference

 

 

 

Section 5 - Hydronic Piping of the Knight

Boiler

Outlet Temp

 

 

Installation and Operation Manual for boiler pump

High

Outlet water temperature has exceeded the

 

specifications.

 

(continued)

maximum outlet water temperature.

Inspect the outlet sensors and associated wiring.

 

 

 

 

 

Measure the resistance of the sensors and compare to

 

 

 

the tables on page 38 of this manual.

 

 

 

 

 

 

 

• Check set point of the external control.

 

 

 

• Check the wiring between the external control and the

Rem Ctrl Flt

External control is cycling too often.

 

unit.

 

 

 

 

 

 

 

• Replace the control.

 

 

 

 

 

 

Parameters

 

 

 

 

Saved

 

 

 

 

(will require a manual

 

 

 

 

reset once the condition

After downloading parameters from a laptop,

• Press the RESET button on the

SMART

has been corrected. Press

the main control board must be reset.

 

TOUCH display panel.

 

the RESET button on the

 

 

 

SMART TOUCH display

 

 

 

 

to reset.)

 

 

 

 

 

 

 

 

While the unit is in Service Mode, the outlet

• Establish a heating load to remove the heat from the

 

temperature has exceeded 185°F.

 

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 5 - Hydronic Piping of the

 

 

 

Crest Installation and Operation Manual for the proper

Service Blk

 

 

piping methods for the Crest 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 5 - Hydronic Piping of the Crest

 

 

 

Installation and Operation Manual for

boiler

 

 

 

pump specifications.

 

 

 

 

 

 

47

Page 47
Image 47
Lochinvar 1.5, 3.5, 2.5 service manual Outlet Temp High, Rem Ctrl Flt, Parameters Saved, Service Blk

3, 2, 3.5, 2.5, 1.5 specifications

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