Navien No Hot Water Repair in Greater Vancouver
When a Navien combi or tankless unit stops delivering hot water, the cause is usually the flow sensor, diverter valve, scale, or an ignition/flame fault. ROMA Heating & Cooling diagnoses and restores Navien hot water fast across Greater Vancouver, with factory knowledge of NCB, NHB, NFC and NPE units and genuine parts on hand.
Why Your Navien Has No Hot Water
- Flow-sensor fault — the unit cannot detect water demand and does not fire for hot water.
- Stuck diverter valve — on combi units, the valve stays on heating and never switches to hot water.
- Scale in the heat exchanger — reduces output, causing weak or fluctuating hot water.
- Ignition or flame fault — an E003 or E012 lockout stops the burner firing.
- Low gas pressure — limits the unit’s ability to heat water on demand.
What You Can Safely Do
- Check for any error code on the display and note it.
- Confirm the gas is on and the unit has power.
- Make sure isolation valves are open and the vent terminal is clear.
- Reset once. If hot water does not return, call for service.
How ROMA Restores Navien Hot Water
We test the flow sensor and diverter valve, check gas pressure and ignition, descale the heat exchanger where scale is limiting output, and verify steady hot water through a full draw — with genuine Navien parts so it lasts.
What Our Customers Say
“I had the absolute best experience getting my tankless water heater installed.”
— Alvina August, Google review (★★★★★)
“Good work done by the two hot water heater specialists in fixing the pipes and draining the boiler.”
— Rizwan Kheraj, Google review (★★★★★)
Frequently Asked Questions
Why does my Navien have no hot water?
Common causes are a flow-sensor fault, a stuck diverter valve (on combi units), scale in the heat exchanger, an ignition or flame fault showing a code, or low gas pressure.
My Navien has heat but no hot water — why?
On a Navien combi that usually means a stuck diverter valve or a flow-sensor fault preventing the unit from switching to hot-water mode.
Can scale cause weak Navien hot water?
Yes — scale in the heat exchanger reduces output, causing lukewarm or fluctuating hot water. Descaling typically restores it.
Is no hot water from a Navien an emergency?
If your household depends on it, treat it as urgent. We offer same-day Navien service across Greater Vancouver.
How do you fix it?
We read any code, test the flow sensor and diverter valve, check gas pressure and ignition, and descale if needed, using genuine Navien parts.
Related Navien & Boiler Services
- Navien Boiler Error Codes (Full Guide)
- Navien Boiler Repair
- Navien Tankless No Hot Water Repair
- Navien E012 Flame Loss Repair
- No Hot Water Emergency
- Navien E016 Overheating Repair
Navien Showing This Code? Call ROMA
Resetting clears the lockout but not the cause — the code will return until the fault is fixed. For accurate Navien diagnosis and repair with genuine OEM parts, call (604) 704-0300 or email info@romaheating.ca. Same-day service across Greater Vancouver, gas-licensed since 1999.
What Greater Vancouver Homeowners Say
“Nelson worked hard to get the NTI unit fixed. He was always polite, courteous and on time.”
“As always Nelson was super efficient. Showed up on time and was quick to work. I had a full maintenance done on the fireplaces and furnace. He was awesome. I won’t use anyone else.”
“Excellent service. Andy had a spare Carrier inducer with him which saved us time.”
“Was very prompt to respond to our issues. Technician was scheduled for the day following my initial call.”
“Very professional heating company. Price is reasonable, excellent work.”
“Highly recommend this company. It was a pleasure dealing with Shawn and Nelson.”
“Professional and courteous technicians with attention to detail and customer needs.”
“Always great, friendly service. Serviced the hot water on-demand system. Honest and informative. Thanks!”
“Speedy response time, honest, and professional service from start to finish.”
Why Greater Vancouver Trusts ROMA Heating & Cooling
ROMA Heating & Cooling has installed, repaired and maintained heating and cooling systems across Metro Vancouver since 1999. Our team are TSBC-licensed gas fitters (Gas LGA0202903) and Red Seal-trained technicians — licensed, bonded and insured — and we back every job with upfront, flat-rate pricing and a 100% satisfaction guarantee. We hold a 4.8★ rating from 221+ Google reviews.
- Authorized for 30+ brands (Lennox, Carrier, Viessmann, Navien, Rheem & more)
- Upfront flat-rate pricing — no overtime or hidden fees
- Free, no-obligation estimates on new installations
- Locally owned & operated in Burnaby, BC
No Hidden Fees
Our service rates are transparent and easy to understand. You approve upfront, flat-rate pricing before we start — so you never get a bill you didn’t expect.
Licensed & Bonded
ROMA is a TSBC-licensed gas contractor (Gas LGA0202903). Our technicians are bonded, insured and Red Seal-trained — qualified for any heating or cooling system.
Free Estimates
We offer free, no-obligation estimates on new installations — furnaces, boilers, heat pumps, air conditioners, tankless and hot-water tanks.
ROMA Heating & Cooling is a trusted HVAC contractor serving Metro Vancouver since 1999. We specialize in furnace repair, heat pump installation, boiler services, air conditioning, and emergency heating solutions for residential, commercial, and government clients. Available 24/7, our certified technicians deliver fast, reliable, and affordable HVAC services across Greater Vancouver.