Lochinvar 402 - 2072 Troubleshooting, Fault, Description, Corrective Action, Temp O/Shoot

Copper-fin II/IIE Boiler and Water Heater Service Manual

3 Troubleshooting

Table 3E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator 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 parameters	has been properly purged from the system.
	for the appliance.	• Verify that the appliance is piped properly into the
		heating system. Refer to the Water Connections
		Section of the Installation and Operation Manual for the
		proper piping methods.
		• Check for 120 VAC to the pump motor on a call
		for heat. If voltage is not present, check the wiring
		leading to the main control board. Replace the main
Temp O/Shoot		control board if necessary.
		• If 120 VAC is present on a call for heat and the
(Lockout will reset
automatically after 5		pump is not operating, replace the pump.
minutes or may be
reset immediately once	Outlet water temperature has exceeded the	• Verify that the system is full of water and that all air
condition has been
	maximum outlet water temperature.	has been properly purged from the system.
corrected. Press the
RESET button on the		• Verify that the appliance is piped properly into the
SMART SYSTEM display		system. Refer to the Water Connections Section of
to reset.)		the Installation and Operation Manual for the proper
		piping methods.
		• Check 120 VAC to the pump motor on a call for heat.
		If voltage is not present, check wiring leading to the
		main control board. Replace the main control board
		if necessary.
		• If 120 VAC is present on a call for heat and the pump
		is not operating, replace pump.
		• Replace the main control board.
		• Check setpoint of the external control.
Rem Ctrl Flt	External control is cycling too often.	• Check the wiring between the external control and
		the unit.
		• Replace the control.
Parameters Progr
(Will require a manual		• Press the ENTER/RESET button on the Smart
reset once the condition	After downloading parameters from a laptop,
has been corrected. Press	the main control board must be reset.	System display panel.
the RESET button on the
SMART SYSTEM display
to reset.)

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