beautypg.com

Troubleshooting – Lochinvar CREST 3 User Manual

Page 50

background image

3

Troubleshooting

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

FAULT

DESCRIPTION

CORRECTIVE ACTION

Too Many

Resets - Try Later

Too many manual resets have occurred
during a 15 minute period.

• Wait 15 minutes and try again.

• Turn power off to unit, wait 30 seconds and then turn
power back on.

Internal Fault

The main control board has detected an
internal fault.

• Replace the main control board.

Writing to

Memos

The main control board has detected an
internal fault.

• Replace the main control board.

Flue Temp

Shutdown

The stack temperature has exceeded the
set parameters for the boiler.

• 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.
Measure the resistance of the flue sensor and
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.
• Replace the main control board.

Delta T

Shutdown

The temperature rise across the heat
exchanger has exceeded the set parameters
for the boiler.

• 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 voltage to the boiler pump motor on a call
for heat. If voltage is not present, check the wiring
back to the pump relay. Replace the pump relay 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 pump is the proper size. Reference
Section 5 - Hydronic Piping of the Crest
Installation and Operation Manual for boiler
pump specifications.

Service Manual

50

This manual is related to the following products: