Navien Combustion & Venting Error Repair in Greater Vancouver
Navien combustion-related codes — including E109 and E110 — mean the boiler sensed abnormal combustion or a blocked intake/exhaust and shut down for safety. These are not codes to repeatedly reset. ROMA Heating & Cooling diagnoses Navien combustion and venting faults properly, with combustion analysis, across Greater Vancouver.
What Causes Navien Combustion Errors
- Blocked or frozen vent terminal — snow, ice, leaves, or debris at the outdoor termination (very common in winter).
- Restricted combustion air — a blocked intake or undersized/obstructed venting.
- Poor gas/air mixture — incorrect setup or a gas-pressure issue.
- Dirty burner — affects clean combustion.
- Fan or air-pressure sensor (APS) fault — the boiler cannot confirm correct airflow.
What You Can Safely Do
- Check the outdoor intake/exhaust terminal for snow, ice, or debris and clear it carefully.
- Make sure nothing is blocking the vent indoors or out.
- Reset once. If the code returns, stop and call — combustion faults need professional diagnosis.
How ROMA Repairs Combustion Errors
We inspect the entire intake and exhaust run, clear any blockage, test the fan and air-pressure sensor, clean the burner, and use combustion analysis to confirm a correct, safe gas/air mixture before returning the boiler to service.
What Our Customers Say
“My Viessmann Boiler 100-W stopped working on Wednesday. We called ROMA, the technician came on Thursday and found the issue.”
— Qiming Zhong, Google review (★★★★★)
“I had an issue with my combi boiler and called them. I left a message and received text messages and a call back.”
— M Lamb, Google review (★★★★★)
Frequently Asked Questions
What is a Navien combustion error?
Combustion-related codes (such as E109/E110) mean the boiler detected abnormal combustion or a blocked intake/exhaust, so it shut down for safety.
What causes a Navien combustion error?
A blocked or frozen vent terminal, restricted intake air, poor gas/air mixture, a dirty burner, or a fan/APS fault are the common causes.
Is a combustion error dangerous?
Combustion faults are safety shutdowns and should be diagnosed promptly — do not keep resetting a unit with a combustion-related code.
Can a frozen vent cause this in winter?
Yes — in cold snaps the intake/exhaust terminal can ice over, a very common cause of combustion lockouts in Greater Vancouver.
How do you repair it?
We inspect the full venting run, clear blockages, check the fan and air-pressure sensor, verify combustion with analysis, and confirm safe operation.
Related Navien & Boiler Services
- Navien Boiler Error Codes (Full Guide)
- Navien Boiler Repair
- Navien Venting Error Repair
- Navien E012 Flame Loss Repair
- Navien E003 Ignition Failure Repair
- Emergency Boiler 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.