Lennox International Inc. WING - Manual (Page 30)

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1.- Unit do not work.
• Check electrical supply of the unit.
• Check electrical connexion.
• Check the remote controller and parameter works correctly.
2.- The fan of the unit
works quicker without any
• Check that the filter of the unit is clean.
• Check electrical connexion.
• If the problem persist, check the function of the motor.
3.- Noise on pipe system.
NOTE: Some noises are
normal when unit stop and
• Check refrigerant charge is correct.
• Was the vacuum done correctly?
• Check internal temperature, could be quite low.
5.- The indoor battery
freeze continuously.
• Check the air filter of the indoor unit.
• Check the level of refrigerant.
• Check strangulation air flow or recirculation.
• If the freeze persist the expansion can be obstructed.
• ¿Is the temperature below 21 º C?
• Check indoor temperature sensor.
4.- Excess of condensation
• Check if you have configurate correctly the function mode of the unit.
• Check inverter valve of the outdoor unit.
• Check the plate PCB to the solenoid inverted valve.
6.- Unit work perfectly on
cooling mode, but do not
produce heat on mode heat
• Check possible obstructions in the condensate pan, and also out of the pan.
• Check correct level of the unit.
• Check drainage pipe.
PROBLEM SOLUTION
7.-External fan stop
8.-Excessive pressure of
condensation (Working
cooling cycle) • Check that the external exchanger is not dirty and obstructed.
• Check that there is no condensable gas and air in the refrigerant circuit.
• Check that the external fan works correctly.
• Check that the refrigerant charge is correct
9.-Low pressure
condensation.
(Working on cooling
cycle)
10.-Excessive pressure
on return air (Working
on heat pump)
11.-Low pressure on
return air. (working
on heat pump)
• Check that terminal connexion are slack.
• Check the motor.
• Check the condenser situation.
• Check that that the rele of defrost is not activited
(Units heat pump).
• Check that the refrigerant charge is correct
• Check possible obstruction on the expansion system of the outdoor unit, liquid
• Check that air filter is not dirty or wrong function of indoor fan.
• Check that the refrigerant charge is correct
• Check the situation of inverter valve.
• Check retention valve situation.
• Check that the refrigerant charge is correct
• Check possible obstruction on the expansion system of the outdoor unit
• Check that the external fan works correctly.
• Check the correct function of the defrost thermostat .
POSSIBLE PROBLEMS
MAINTENANCE OF THE UNIT