Corrective Actions - Lochinvar 300 Installation And Operating Manual

CORRECTIVE ACTIONS

See the table below for corrective actions corresponding to the Corrective Action Number in the "System Status And Error Codes"
section above. If following those corrective actions does not resolve the error, refer to "Other Symptoms" table later in
this manual.
Corrective
Action
Number
1 Normal operation, no action necessary.
Normal operation, no action necessary.
2
1. Flame rod not properly seated in flame, reposition rod.
3
2. Clean flame sensor rod with fine steel wood to avoid lock-out.
1. Check that blower operates and does not have any blockages.
2. Check that all wiring is correct.
3. Ensure the air pressure sensing tubes are properly connected and not kinked or damaged.
4. Ensure the air pressure switch is correct and the air pressure switch (N.O.) is not bypassed
4 (jumpered).
5. Turn power to the unit "OFF" – check for continuity of the air pressure switch (N.O.) with wires
disconnected;
a. If the pressure switch contacts show continuity (closed circuit), replace the pressure switch,
b. If the pressure switch contacts are open and all wiring is correct, replace the Gas Control.
1. Ensure the blower is running - check for 120 VAC to the blower when the heating cycle begins.
a. If the Gas Control does not energize the blower - replace the Gas Control.
b. If the blower fails to start when energized:
i. Turn power to the heater "OFF" – check if the capacitor is connected;
ii. Turn power to the heater "OFF" – check the capacitor rating (3uF +/-5%);
iii. Turn power to the heater "OFF" - replace the blower assembly.
2. Ensure the air pressure sensing tubes are properly connected and not kinked or damaged;
3. Check continuity of the vent temperature limit switch – replace switch if contact remain open.
4. Check continuity of the air pressure switch (N.C.) – replace switch if contact remain open.
5 5. Ensure the correct size of exhaust and air intake pipes were used per the instruction manual
for vent length. Ensure maximum number of elbows or equivalent feet of both pipes was not
exceeded.
6. Ensure there are no obstructions in the exhaust and air intake pipes.
7. If there are excessive restrictions in the air intake pipe the air pressure switch (N.C.) will open.
8. Check air pressure switch performance - Check blower vacuum with a manometer - Compare
with air pressure switch (N.O.) setting. If the air pressure switch proves defective – replace the air
pressure switch (N.O.).
9. If the air pressure switch (N.O.) performance test results prove the air pressure switch is working
properly, and all other steps are followed, and fault code persist – replace the control.
Resetting the ECO (Energy Cut-Out) requires manual intervention. It cannot be reset by cycling power
to the control.
Reset Procedure
6 1. Manual reset is performed by turning the set point knob to lowest set point position for a minimum
of 10 seconds and then return it to the desired set point.
2. The manual reset of the ECO can only be performed 2 times, after the ECO trips a third time, the
gas valve will enter a hard lock out where the gas control will need to be replaced.
1. Turn the power "OFF" for 10-20 seconds then "ON" again to clear the fault code.
2. Flame rod not properly seated in flame, reposition rod.
7
3. Clean flame sensor rod with fine steel wood to avoid lock-out.
4. Replace the control if the fault code persists.
100304522_2000545236 _Rev. 02
Corrective Action
www. lochinvar .com 57