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Hi I keep getting a ch 67 after the unit starts fine and runs for like five minutes fan on all units work during that five minutes any thoughts would be greatly appreciated

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Low freon pressure switch is turning it off. As the coils cool down the pressure drops. As time goes on it will run shorter and shorter cycles. In warm weather freon 22 low pressure should be near 70 lb
410A freon about 150 on the low side

Posted on May 03, 2015

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