Ask Experts Questions for FREE Help !
    Lassleesa's Avatar
    Lassleesa Posts: 1, Reputation: 1
    New Member

    Apr 30, 2008, 03:51 AM
    Mears Thermostat Model M 70 - whining!
    Mears thermostat looks like model M70 or 7D - double line break.. in new rental unit making a head splitting high pitched whining noise every time heat is called for. It's an oldie. When I tap the metal sheet insisde the outer face plate it stops. Resumes again next time heat is called for.
    Does she need to be replaced?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert

    Apr 30, 2008, 02:14 PM
    You might test to see how many amps are going through the thermostat to see if it is overloaded. Then if that is OK I would replace the thermostat.

Not your question? Ask your question View similar questions


Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.

Check out some similar questions!

Mears Thermostat [ 11 Answers ]

I just replaced a MEARS thermostat for my electric baseboard heat that would only operate in the full on or full off position. In other words "all or nothing". I put in a new MEARS M 612 and wired it the same way the old thermostat was wired. This also agreed with the schematic that came with...

Mears Thermostat [ 1 Answers ]

Hi! I am a property manager for an older apartment complex. I am desperately searching for some MEARS thermostat knobs. I do not have a model number. The thermostat is an off white color. I need to know how I go about ordering extra knobs, as many of the apartments are without. If someone...

Hunter Thermostat Model #47300 [ 5 Answers ]

Hi, I want to install a Hunter Thermostat 47300, however, the instructions call for the existing wiring as a green, red and white. My old wiring is brown, blue and teal colored. I don't want to hook up until I understand the wire coloring. The condo was built in 1972 and I only need to get...

Honeywell thermostat model #t8411r [ 1 Answers ]

Our system controls both the central air and heat in our home (which is a rental). Yesteday I noticed that after I had switched on the heat that the thermostat was no longer working. We have checked all the breakers and examined the circuit board, however, I am still in a quandry if this is a...

View more questions Search