We recommend using the lithium batteries when your temperatures get below -4F for an extended period of time. If you re not reaching those levels please use the recommended batteries following the battery guidelines below.
When you get to temperatures that low do you still have 4 bars on the indoor display? How far is the sensor from the display, and what type of construction material is the house made of?
•Verify you are using fresh alkaline batteries or lithium batteries (when temperature is below -4oF/-20oC) in sensor.
•Quality brand batteries are recommended, including Duracell, Rayovac, Energizer, or Kirkland.
•Verify batteries are fresh. The battery expiration date should be at least 6 years out. Batteries can lose 3% power or more every year in storage.
•Heavy duty, extra strength or generic / store brand batteries are not recommended for use with AcuRite products because they may cause performance irregularities due to the way these types of batteries disperse power. Each battery should not exceed 1.6 volts.
•Rechargeable batteries are not recommended for use with AcuRite products because they may cause performance irregularities due to the voltage instability of these types of batteries.
•Mixing different battery types (brands, old/new, etc.) is not recommended.
If this does not correct the issue please let us know.
Our house is a standard wood frame house with vinyl siding. The distance between the sensor and receiver at maximum was 50 feet and minimum 25 feet with the sight line being a wall or window or two windows, always with the same results. It stops working below 36 to 23 degrees Fahrenheit consistently. Above those temperatures or indoors it works fine.
I have ALWAYS used fresh, newly purchased batteries with expiration dates of 15 plus years.
I have tried Duracell and Energizer Alkaline. Also Energizer Lithium when the forecast was to dip below zero.
I was ready to trash this thing when the gift giver told me it was no cheap knock off and I should pursue warranty, so here I am.