Fans : Fan coils and motors failing due to boiler overheating will not be covered under warranty. Duo Tec 28 HE 47-075-25. Duo Tec 28 HE A (After Serial No.CAC0929 Issue 9) 47-075-36. Duo Tec 28 HE A (Before Serial No.CAC0929 Issue 9) 47-075-36 BEFORE.
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