On Tue, 8 Dec 2015 08:17:27 -0500, Peter wrote:

On 12/8/2015 2:12 AM, Micky wrote:
On Mon, 7 Dec 2015 08:54:25 -0500, Peter wrote:


To fix problem #2, I removed the bottom plate of the control unit
by taking out the two small Phillips head screws. I turned an
adjusting screw on the thermostat relay to narrow the gap between
the relay arms, thereby reducing the temperature deviation required
to cycle the thermostat.

You know, I thought there was a thermal-swtich in the blanket, that
controlled the relay in the box, and the control was Yes or No.
Not a thermal rheostat. ???

CAUTION: The adjustment screw will have 120V if the controller is
plugged in. Either use an insulated screwdriver or unplug the
controller before attempting this. You can tell when the gap is
appropriate by turning the adjustment screw and then rotating the
temperature control dial back and forth. You should aim for a
position of the relay arms to cause the relay to open/close with
less than a 1 number rotation of the temperature control dial.
Before I did this, I was getting a 2-3 number deviatio

I may be mistaken, but my perception is that in my model of electric
blanket, the thermal switches sewn in the blankets are over-heat
(safety) protection sensors. I think the bedside controllers sense
ambient temperature and have a built-in local mini-heater that warms up
both the controller thermostat's bi-metallic sensor and the blanket when
the relay is closed. When the local heater warms up the thermostat's
sensor, the relay opens, turning off both the bi-metallic heater and the

You might well be right. Thanks. Maybe I'll look inside some day.

blanket. I use an electric blanket and have it sandwiched above a
woolen blanket but below a bedspread with a comforter on top of the
bedspread. The added insulation on top of the blanket maximizes
retention of the blanket's heat. However, as our house cools off during
the night (thermostat lowered from 68 to 58), I hear the blanket
controller cycling more frequently and I sometimes have to turn down the
blanket's controller to avoid feeling too warm.