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My rheem prestige turns off and on continuously, never wuite attaining the preset temp. LED flashes 11 and 13. What does that mean?

Post created: 2012-12-20 Type of Equipment: Furnace Views: 58

This question was created on the page: https://www.furnacecompare.com/furnaces/rheem/prestige-90-plus.html.

Furnace turns off and on, constantly. It never quite achieves the set temp by about 2 deg. Since initial install, the blower would squeal briefly while on a high setting. The installer never fixed it. I have had this Rheem Prestige for 2 years now. This heating problem is recent (2 weeks). I replaced batteries in thermostat, changed filter but that's all I can do.

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