Ask Me Help Desk - My a/c is not cooling, it reading 70 degree, but it's about 90 it comes on for a seco

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My a/c is not cooling, it reading 70 degree, but it's about 90 it comes on for a seco

Have a Robertshaw 9420 thermostat my second one! It is blank but flash sometimes showing the temp at 70 degree, can't adjust the setting it come on for a second or two then shut off for about 45 minutes. It is about 90 degree

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