Question about Honeywell Programmable Thermostat Heater
You have a heat pump and EM means it takes the heat pump out and uses the back up heat weather it be gas or electric. With your unit frosted up outside you might want to put it back on regular heat and watch the unit outside to see if it comes on first of all and then should go through a defrost stage. Makes a weird sound don't think nothing about it that is normal. Your outside temp. right now really cold to frost up the condensing unit. Let me know if you need anymore clarification or help ok. ken
Posted on Feb 01, 2010
Hi, EM stands for emergency heat. You should only need to use it if the outdoor unit does not operate. You have what we call a heat-pump. If the outdoor coil is iced up, it should go into a defrost cycle to melt away the ice. You will know when it does as you will see steam coming up from the unit as though it is on fire. The outdoor fan will also shut down during this process. These units will defrost using time and temperature to defrost the coil. If the ice continues to build-up, and does not defrost every couple of hours, I would say you have a faulty defrost board or defrost thermostat. There is not alot you can do as these are very complicated systems to work on. You will more then likely have to call out a service tech to check this outdoor unit for you.It also should have heat strips in the outdoor unit for EM heat if the outdoor unit fails. If it is iced up it is on and running. Thats what I would do is keep an eye on it to see if it does defrost, and if not, you will need to get a tech out to check it. It takes special equipment to check these units. Please keep me posted.
Posted on Feb 01, 2010
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Posted on Jan 02, 2017
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