Lochinvar 540H Installation Manual And Owner's Manual page 61

Controller Green Malfunction
LED description
331*
Two Outlet thermistor fail-
ure (540H only)
Flashes
341*
Two Exhaust thermistor failure
(Indoor models only)
Flashes
391*
Two Air-fuel ratio rod fail-
ure
Flashes
441
Two Flow sensor failure
(Easy-Link System only)
Flashes
510
Six Abnormal main gas
solenoid valve
Flashes
551
Six Abnormal gas solenoid
valve
Flashes
611*
Four Fan motor fault
Flashes
651*
Four Flow adjustment valve
fault (Easy-Link System
Flashes
only)
661*
Four Bypass valve fault
(540H only)
Flashes
One
701*
Computer board fault
Flash
711*
One Gas solenoid valve
drive circuit failure
Flash
721*
Six False flame detection • For indoor models, check if condensate drain is installed on the vent collar of
Flashes
741
N/A Miscommunication
between water heater
and remote controller
751
N/A Miscommunication
between water heater
and built-in controller
(Indoor models only)
761
N/A Miscommunication in
Easy-Link System
941
Five Abnormal exhaust
temperature (Indoor
Flashes
models only)
991
Five Imperfect
combustion
Flashes
*These error codes will be cleared when water flow stops.
• Check for connection/breakage of wires and/or debris on thermistor (Part
#407, 408, 411, 715, 718 721).
• Check for connection/breakage of wires (Part #709) and/or soot on the AFR
rod (Part #108).
• Check for connection/breakage of wires and/or debris on the flow sensor
impeller (Part #402).
• Verify the shutoff valves on the hot and cold water line to the water heater
are open.
• Inspect the filter for blockage/debris. Refer to the procedure on p.51.
• Check for connection/breakage of wires (Part #708) and/or burn marks on the
computer board (Part #701).
• Check for connection/breakage of wires (Part #708) and/or burn marks on the
computer board (Part #701).
• Check for connection/breakage of wires, dust buildup in the fan motor (Part #103)
and/or burn marks on the computer board (Part #701).
• Check for frozen/corrosion of connectors (Part #103).
• Inspect the flow adjustment valve (Part #402), for connection/breakage of
wires, locked motor drive due to scale buildup, and/or water leakage.
• Inspect the bypass valve (Part #403), for connection/breakage of wires, locked
motor drive due to scale buildup, and/or water leakage.
• Check for connection/breakage of wires (Part #714).
• Refer to the 111 and 121 error codes.
the water heater.
• Check if there is leaking from heat exchanger (Part #401).
• Check the model type of the remote controller.
• Inspect the connections between the water heater and remote controller.
• Check the power supply of the water heater.
• Inspect the connections between the water heater and built-in controller.
• Check the power supply of the water heater.
• Check if the connections between the parent unit and the child units are cor-
rect. Refer to pp. 38 to 39.
• Check that power is on to all heaters.
• Check if the set temperature is higher than 140 °F (60 °C) and the system is
Recirculation.
• Check for connection/breakage of wires, dust buildup in the fan motor (Part #103).
• Check for connection/breakage of wires of the hi-limit switch for exhaust (Part
#472, 721).
• Check the gas type of the water heater.
• Inspect the environment around the water heater. Determine how long the
unit has been installed.
• Check the altitude/elevation of the area where the water heater is installed.
• Check if there is any blockage in the intake air and/or exhaust.
• If the water heater is installed as a direct-vent system, check whether there is
enough distance between the intake air terminal and the exhaust terminal.
• Check if there is grease and/or dirt in the burner (Part #101) and the fan motor
(Part #103), especially if the water heater has been installed in a contaminated
area.
61
Page
Owner's Guide
Troubleshooting
Diagnosis