outside unit freezes over in heat mode

Unit heats interior of home but the outside unit coils freeze completely over with 3" to 4" ice while heating.
Can pour hot water over outside of unit and place the thermostat on cooling mode to reverse flow through coils and thaw out the unit and then the inside air flow is warmer when placed back into heat mode. Have been told by a.c. service tech this is normal. Unit is about 12 to 14 years old and only started doing this in the past 4 or 5 years. If this is normal, why did it not do this all the time? The previous unit never froze over no matter how cold it was outside.

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Oct 23, 2014
Bad Technician
by: Ex-HVAC Instructor

You need to call a different technician. The unit is not defrosting, so something in the defrost system is not working properly. Hard to say exactly what because of the variety of defrost systems used.

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