Lochinvar SNR200-100 Troubleshooting, Fault, Description, Corrective Action, Temp O/Shoot, Progr

TM

Installation & Service Manual

13 Troubleshooting

Table 13E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface

FAULT	DESCRIPTION		CORRECTIVE ACTION
	The temperature rise across	the heat	• Verify that the system is full of water and that all air
	exchanger has exceeded the set		has been properly purged from the system.
	parameters for the water heater.		• Verify that the water heater is piped properly into the
			heating system. Refer to Section 6 - System Piping
			for the proper piping methods for the Shield water
			heater.
			• Check for 120 VAC to the water heater 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 water
			heater pump is not operating, replace the pump.
			• Verify that the water heater pump is set to the proper
Temp O/Shoot			speed or that the pump is the proper size.
			Reference Section 6 - System Piping for water heater
(continued)
			pump specifications.
	Heat exchanger outlet water temperature		• Verify that the system is full of water and that all air
	has exceeded the maximum outlet water		has been properly purged from the system.
	temperature.		• Verify that the water heater is piped properly into the
			heating system. Refer to Section 6 - System Piping
			for the proper piping methods for the Shield water
			heater.
			• Check for 120 VAC to the water heater 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 water
			heater pump is not operating, replace the pump.
			• Replace the main control board.
Parameters	After downloading parameters from a		• Press the ENTER/RESET button on the	display
Progr
	laptop, the main control board	must be	panel.
(will require a manual	reset.
reset once the condition
has been corrected. Press
the RESET button on the
display to reset.)
			• Check condensate tube from unit to floor drain for
Blocked Drain			proper installation and obstructions.
SW	The blocked drain switch has	detected	• Inspect condensate trap for blockage.	Clean if
(will retry after 5			necessary.
	excessive condensate build up inside the
minutes. RESET may be
	unit.		• Check for loose wiring connection at wire harness
pressed after condition is			plug.
corrected.)
			• Bad blocked drain switch. Replace switch.

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