Fan is operating, heaters are operating when forced in defrost, drain is clear. Need advice please.??
I usually start by looking at the formation of the ice. If it is even across the evaporator coil I'll check the evaporator fan and air flow - blocked air flow or slow fan. Check the defrost timer. Depending on what type you have see if the timer is turning. I would put it into defrost mode and wait for it to turn out of the defrost cycle and into normal mode. Sometimes the timer does get stuck in either mode. If so I'd change the defrost timer because most times it will get stuck again. If it is not even across the coil it may be a refrigeration issue such as restriction or low refrigerant. Lastly, see how the product is stored in the freezer. I had one call where they removed the items because the freezer was not working because the evaporator was ice. Everything checked ok. I found they filled the freezer with the bags covering the fan causing it to freeze quickly.
simple defrost timer problem. Works when you advance it manually, but does not defrost on it's own. Replace the timer.
Retrieving data ...