Lochinvar LTN07575 Instruction Manual page 35

TABLE 5. STATUS LIGHT AND DIAGNOSTIC CODE TROUBLESHOOTING CHART
LED Status
5 FLASHES
7 FLASHES
8 FLASHES
Problem
The temperature sensor (thermistor) is defec-
tive.
Gas Control Valve failure.
This condition only appears if the gas control/
temperature knob has been turned off and the
thermopile continued to produce electric pow-
er. This condition can occur if the thermopile
does not cool down as quickly as expected
when the unit is shut off. This condition can
also occur if the gas control/temperature knob
has been turned off and the pilot continues to
operate because the pilot valve is stuck in the
open position.
Turn Gas Control Valve/Thermostat knob to OFF. Turn
Main Gas Supply OFF. Replace the Gas Control Valve/
Thermostat. See Removing and Replacing the Gas
Control Valve/Thermostat (page 32).
Turn Gas Control Valve/Thermostat knob to OFF. Turn
Main Gas Supply OFF. Replace the Gas Control Valve/
Thermostat. See Removing and Replacing the Gas
Control Valve/Thermostat (page 32).
Make sure that the gas control valve/thermostat knob
is set to OFF. Wait one minute. Remove the outer door.
Look through the sight glass for a pilot flame. If a pilot
flame is observed with the gas control valve/thermostat
knob set to the OFF position, the pilot valve is stuck
open. Turn the main gas supply OFF. Replace the gas
control valve/thermostat. For instructions, see Remov-
ing and Replacing the Gas Control Valve/Thermo-
stat (page 32).
If the pilot flame is not observed when the gas control
valve/thermostat knob is set to the OFF position, wait
10 minutes for the thermopile to cool, then attempt to
relight the pilot by following the lighting instructions on
the water heater's label. If this condition returns, re-
place the gas control valve/thermostat. See Removing
and Replacing the Gas Control Valve/Thermostat
(page 32).
35
Corrective Action