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2 wire or 4 wire? Are you wiring it correctly? Check the baseboard and look how that is wired as well...

Huh, I googled it and this is what someone said...

1.0 out of 5 stars Flawed design, December 18, 2010
Dave Schultz (Spirit Lake, IA) - See all my reviews

Amazon Verified Purchase(What's this?)
This review is from: Honeywell YRLV310A1026/U Digital Non-Programmable Thermostat for Electric Baseboard Heating (Tools & Home Improvement)
I believe this thermostat has a fatal design flaw --- at least for our application which is a fairly large room with significant heat loss. I installed this to replace a Honeywell Digital LineVoltPro(tm) 7000 which died after working just fine for several years. The temperature reading for this RLV310 thermostat reads from 1 to 7 degrees below the actual room temperature. (Actual room temperature measured by three different digital thermometers mounted in close proximity to the YRLV310's sensor, all measuring within 1 degree.) One would suggest just lowering the set point, but that doesn't work since the sensed temperature varies so much. Worse yet, the sensed temperature error grows larger as more power is delivered to the heaters; the largest offset occurs when the thermostat is pumping out the most power to the heater. This results in a fatal "runaway" which keeps the heater on indefinitely in our application, even when the room the room temperature get up over 75d and the set point is less than 70d.
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