A Lochinvar PRS3406 Pressure Switch senses water pressure and changes the circuit state to regulate safe response within the unit.
The pressure switch monitors water pressure within the HVAC system and signals the controls when flow conditions are correct for safe operation. Its calibrated design matters because accurate pressure response protects heating and cooling equipment from operating under improper water conditions that can reduce performance or cause damage.
The pressure switch may need to be replaced if the heating and cooling unit shows shutdowns, lockouts or inconsistent operation related to water flow or pressure sensing. Common indicators include visible wear, corrosion, moisture exposure or damaged terminals and you might notice issues becoming more frequent in harsh environmental conditions or after prolonged use.
Yes! We offer same-day shipping on in-stock real OEM HVAC parts Monday—Friday until 9 PM ET and on Saturday until 4 PM ET for online air orders. With our extensive system of fulfillment centers, we keep delivery as fast as possible. See shipping information about your real OEM HVAC replacement parts by visiting our Track My Order page and putting in your order number or purchase order (PO) number and zip code. Delivery details are updated in real time, so it's easy to stay informed once they've shipped. Customer support for real OEM heating and cooling replacement parts is available through several channels 8 AM to 9 PM ET Monday—Friday with chat, email and phone among the options. Go to our Contact Us page to see all the ways to reach us if you need help with an issue regarding your order. Of course! We provide the option to return most new, unopened real OEM heating and cooling replacement parts within 90 days of delivery, so go to our Returns page and see if your order qualifies. If the item has been installed and no longer works, complete the form in the Defective Parts & Warranty Inquiries section.Read More FAQs
Will my Lochinvar PRS3406 Pressure Switch ship the same day I order?
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Is the Lochinvar PRS3406 Pressure Switch eligible for returns?