Service Manual

3 Troubleshooting

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

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

Louver Proving

 

 

 

 

 

 

Sw Open

 

• Check function of remote devices.

 

(will require a manual

An optional remote proving switch is not

 

reset once the condition

 

 

 

 

 

has been corrected. Press

making.

• Check for loose or misplaced jumper if proving switch

the RESET button on the

 

is not installed.

 

 

 

SMART TOUCH display

 

 

 

 

 

 

to reset.)

 

 

 

 

 

 

 

 

 

 

 

• Inspect the heat exchanger. Reference page 35 of

 

 

this manual for the procedure on how to clean the flue

 

 

side of the heat exchanger.

 

 

 

 

• Inspect the flue sensor and associated wiring.

Flue Temp High

The stack temperature has exceeded the set

Measure the resistance of the flue sensor and

parameters for the boiler.

compare to Table 3E on page 38 of this manual.

 

 

Replace the sensor if necessary.

 

 

 

• Verify that the vent/air intake pipes are properly

 

 

installed and that there are no obstructions.

 

 

 

• 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 piping methods for the Crest boiler.

 

 

• Check for 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

Delta T High

The temperature rise across the heat

control board if necessary.

 

 

 

 

 

 

 

 

exchanger has exceeded the set parameters

• If 120 vac is present on a call for heat and the boiler

 

for the boiler.

pump is not operating, replace the pump.

 

 

 

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

 

 

or that the pump is the proper size. Reference

 

 

Section 5 - Hydronic Piping of the Crest

 

 

Installation and Operation Manual for

boiler

 

 

pump specifications.

 

 

 

 

 

• Inspect the inlet and outlet sensors and associated

 

 

wiring. Measure the resistance of the sensors and

 

 

compare to the tables on page 38 of this manual.

 

 

 

 

 

• 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

Outlet Temp

 

Crest

Installation

and

Operation

Manual

Outlet water temperature has exceeded the

for the proper piping methods for the Crest boiler.

High

• Check for 120 vac to the boiler pump motor on a call

 

maximum outlet water temperature.

 

 

for heat. If voltage is not present, check 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.

 

 

 

 

 

 

 

 

46

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Image 46
Lochinvar 3.5, 1.5, 2.5 service manual Louver Proving Sw Open, Flue Temp High, Delta T High, Outlet Temp
Page 45 Page 47

3, 2, 3.5, 2.5, 1.5 specifications

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