What do SH and DHW mean on a Navien?
SH is space heating, the heat for your house. DHW is domestic hot water, the hot water at your taps. A Navien combi boiler does both, and the display shows each one’s setting and what it’s doing right now.
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From one of our jobs
A Navien combi boiler display, up close
Right now: If the house is warm but the taps run cold, check whether the DHW line reads OFF and turn it back on.
On this one, DHW reads OFF, which means hot water to the taps is switched off at the boiler. That’s sometimes on purpose in a house that sits empty for a while, and sometimes an accident from the wrong button. If the house is warm but the showers are cold, check that line first.
The temperatures on the screen are the water going out to the radiators or baseboard and the water coming back. The pressure reading beside them should hold steady, not creep up or keep dropping. A code with an E or a three digit number is the boiler asking for service.
Quick answers
What people ask about Navien displays
What does SH mean on a Navien boiler?
Space heating. It’s the heat side of the boiler, the hot water it sends to your radiators or baseboard.
What does DHW mean on a Navien?
Domestic hot water, the water at your faucets and shower. On a combi boiler the same unit heats both.
Why does my Navien say DHW OFF?
Hot water was switched off at the display. Turn it back on from the hot water setting. If the taps still run cold, call.
What does an error code on my Navien mean?
It’s the boiler telling you why it stopped. Write the code down. Our Navien error code guide explains the common ones.
Who services Navien boilers in Northern Virginia?
Call SwiftPro at (703) 997-9757. We service and repair Navien boilers and tankless water heaters across Northern Virginia.
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SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
SwiftPro Plumber & Water Heaters
4200 Lafayette Center Dr, Suite N, Chantilly, VA 20151
Virginia Class A contractor license #2705192276