Service Manual

3 Troubleshooting

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

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

 

• 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 120 vac to boiler pump motor on a call for

 

 

heat. If voltage is not present, check wiring back to

 

 

the main control board.

 

 

 

 

 

• Check the ARHL set point.

 

 

Auto Reset

The outlet water temperature has exceeded

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

the setting of the automatic reset high limit.

pump is not operating, replace the pump.

 

High Limit

 

 

 

 

 

 

• If the system pump is a variable speed pump, ensure

 

 

 

 

that the system flow is not less than the boiler flow.

 

 

• If operating on something other than an outlet sensor,

 

 

check temperature setting of the main control board.

 

 

• If the optional manual reset high limit has tripped,

 

 

check setting of the device.

 

 

 

 

• Check resistance of water sensors and compare to

 

 

Table 3B on page 38 of this manual. Replace

 

 

sensor if necessary.

 

 

 

 

 

• Replace the main control board.

 

 

 

 

 

 

• 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 voltage to boiler pump motor on a call for

 

 

heat. If voltage is not present, check wiring back to

Manual Reset

 

the main control board.

 

 

 

 

• Replace the pump relay if necessary.

 

High Limit Open

 

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

(will require a manual

The outlet water temperature has exceeded

pump is not operating, replace the pump.

 

reset once the condition

 

the setting of the high limit.

• If the system pump is a variable speed pump, ensure

has been corrected. Press

the RESET button on the

 

that the system flow is not less than the boiler flow.

SMART TOUCH display

 

• If operating on either an inlet or system supply sensor,

to reset.)

 

check temperature setting of the main control board.

 

 

• If the high limit has tripped, check setting of the

 

 

device and the MRHL set point.

 

 

 

 

• Check resistance of water sensors and compare to

 

 

Table 3B on page 38 of this manual. Replace

 

 

sensor if necessary.

 

 

 

 

 

• Replace high limit (if equipped).

 

 

 

• Replace main control board.

 

 

 

 

 

 

 

 

 

44

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Image 44
Lochinvar 1.5, 3.5, 2.5 service manual Auto Reset, Manual Reset, High Limit Open
Page 43 Page 45

3, 2, 3.5, 2.5, 1.5 specifications

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