Lochinvar 402 - 2072 Service Manual page 42

3
Troubleshooting
Table 3E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface
FAULT
Temp O/Shoot
(Lockout will reset
automatically after 5
minutes or may be
reset immediately once
condition has been
corrected. Press the
RESET button on the
SMART SYSTEM display
to reset.)
Rem Ctrl Flt
Parameters Progr
(Will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
42
Copper-fin II/IIE Boiler and Water Heater
DESCRIPTION
The temperature rise across the heat
exchanger has exceeded the set parameters
for the appliance.
Outlet water temperature has exceeded the
maximum outlet water temperature.
External control is cycling too often.
After downloading parameters from a laptop,
the main control board must be reset.
CORRECTIVE ACTION
• Verify that the system is full of water and that all air
has been properly purged from the system.
• 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
control board if necessary.
• If 120 VAC is present on a call for heat and the
pump is not operating, replace the pump.
• Verify that the system is full of water and that all air
has been properly purged from the system.
• Verify that the appliance is piped properly into the
system. Refer to the Water Connections Section of
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.
• Check the wiring between the external control and
the unit.
• Replace the control.
• Press the ENTER/RESET button on the Smart
System display panel.
Service Manual