Honeywell HD3HDIH User Manual page 12

In the event you have a problem with any Honeywell product, please call Customer
Service at 1 800 323 4576 for assistance or to request a Return Merchandise
Authorization (RMA) number.
Be sure to have the model number, serial number, and the nature of the problem available
for the technical service representative.
Prior authorization must be obtained for all returns, exchanges, or credits. Items shipped
to Honeywell without a clearly identified Return Merchandise Authorization (RMA)
number may be refused.
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