I have central heating and air. The unit is on the roof. When the heater is running it makes a high pitched whistling noise. Other than that, the heater works great. Any ideas? Can I fix it myself or do I need to call a repair man?
I have central heating and air. The unit is on the roof. When the heater is running it makes a high pitched whistling noise. Other than that, the heater works great. Any ideas? Can I fix it myself or do I need to call a repair man?
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