Lennox International Inc WING manual Maintenance of the Unit Possible Problems Solution

MAINTENANCE OF THE UNIT

POSSIBLE PROBLEMS

PROBLEM		SOLUTION
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	• Check refrigerant charge is correct.
normal when unit stop and	• Was the vacuum done correctly?
￿￿￿￿￿￿	• Check internal temperature, could be quite low.
	• Check possible obstructions in the condensate pan, and also out of the pan.
4.- Excess of condensation	• Check correct level of the unit.
￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿	• Check drainage pipe.
	• Check the air filter of the indoor unit.
5.- The indoor battery	• Check the level of refrigerant.
	• Check strangulation air flow or recirculation.
freeze continuously.
	• If the freeze persist the expansion can be obstructed.
	• ¿Is the temperature below 21 º C?
	• Check indoor temperature sensor.
6.- Unit work perfectly on	• Check if you have configurate correctly the function mode of the unit.
cooling mode, but do not
	• Check inverter valve of the outdoor unit.
produce heat on mode heat
	• Check the plate PCB to the solenoid inverted valve.
￿￿￿￿
	•	Check that terminal connexion are slack.
7.-External fan stop	•	Check the motor.
	• Check the condenser situation.
	• Check that that the rele of defrost is not activited
	(Units heat pump).
8.-Excessive pressure of	•	Check that the external exchanger is not dirty and obstructed.
condensation (Working	•	Check that there is no condensable gas and air in the refrigerant circuit.
cooling cycle)	•	Check that the external fan works correctly.
	•	Check that the refrigerant charge is correct
9.-Low pressure	•	Check that the refrigerant charge is correct
	•	Check possible obstruction on the expansion system of the outdoor unit, liquid
condensation.
	￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿
(Working on cooling
	•	Check that air filter is not dirty or wrong function of indoor fan.
cycle)
10.-Excessive pressure	•	Check that the refrigerant charge is correct
on return air (Working	•	Check the situation of inverter valve.
on heat pump)	•	Check retention valve situation.
11.-Low pressure on	•	Check that the refrigerant charge is correct
return air. (working	•	Check possible obstruction on the expansion system of the outdoor unit
on heat pump)	•	Check that the external fan works correctly.
	•	Check the correct function of the defrost thermostat .

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