Pool heater repair. When I arrived and turned on the pool heater, it was making a very loud whining sound. Sounded so bad I was afraid to let it run any longer, and shut it off after only about a minute. I did not want to further damage the heater. I tried adjusting gas pressure because that’s a cause of a whining sound on this unit, but it did not work. The paperwork said it was a gas heater, and I found no indication that it was LP when I looked at the valve and model #. This unit is 60 days old and was just installed by the customer himself last week, and this issue has been there since the installation. I told the customer to contact whom he purchased the heater and have someone come out from the customer warranty department, if they have one, per Chris.