Lochinvar 50-210 Troubleshooting continued, Fault, Description, Corrective Action, Service Manual

Service Manual

3Troubleshooting (continued)

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

FAULT	DESCRIPTION	CORRECTIVE ACTION
	The stack temperature has exceeded the set	• Inspect the heat exchanger. Reference page 27 of
	parameters for the boiler.	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 3C on page 30 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.
	The temperature rise across the heat	• Verify that the system is full of water and that all air
	exchanger has exceeded the set parameters	has been properly purged from the system.
	for the boiler.
		• Verify that the boiler is piped properly into the heating
		system. Refer to Section 6 - Hydronic Piping of the
		Knight Wall Mount Installation and Operation Manual
		for the proper piping methods for the Knight wall mount
		boiler.
		• Check for 120 vac to the boiler pump motor on a call
Temp O/Shoot		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 pump is the proper size. Reference
		Section 6 - Hydronic Piping of the Knight Wall Mount
		Installation and Operation Manual for boiler pump
		specifications.
	Outlet water temperature has exceeded the	• Verify that the system is full of water and that all air
	maximum outlet water temperature.	has been properly purged from the system.
		• Verify that the boiler is piped properly into the heating
		system. Refer to Section 6 - Hydronic Piping of the
		Knight Wall Mount Installation and Operation Manual
		for the proper piping methods for the Knight wall mount
		boiler.
		• Check for 120 vac to the boiler pump motor on a call
		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.
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