Navien Boiler Repair That Fixes the Real Problem
When your Navien boiler loses heat, shows error codes, or drops pressure, you need a tech who tests the system and finds the root cause, not a guess.
Efficient Heating Service focuses on Navien Boiler Repair across the Lower Mainland with clean diagnostics, OEM-part recommendations, and repairs that hold up.
If you want the full repair overview for all boiler brands, visit our boiler repair page
If you’re comparing options, our boiler servicing can prevent repeat breakdowns, and our
boiler installation team can help when a repair no longer makes financial sense.
Common Navien Boiler Problems We Repair
Navien boilers are efficient, but like any high-performance system, small issues can cause lockouts, short cycling, or unstable temperatures.
Our goal is simple: confirm the fault, verify supporting conditions, and fix the cause so the boiler runs steady again.
- No heat or intermittent heat
- Error codes and repeated lockouts
- Pressure dropping or frequent top-ups
- Short cycling or running non-stop
- Ignition failure and flame-sense issues
- Condensate drain and trap problems
- Circulation or flow-related faults
- Fan, venting, or air-intake restrictions
- Overheating and limit trips
- Domestic hot water temperature swings (combi systems)
- Sensor failures (temp, pressure, flow)
- Control and wiring issues
Navien Boiler Parts We Commonly Replace
We only recommend parts after testing confirms the failure. Many “bad part” diagnoses are really caused by flow, venting, condensate, or system-pressure problems.
When parts are needed, we match the fix to the specific Navien model and error history.
- Igniter and flame sensor
- Gas valve
- Fan motor
- Control board
- Pressure sensor
- Temperature sensors
- Circulator pump (or pump components)
- 3-way valve / diverter (combi models)
- Flow sensor / DHW flow components
- Air intake / exhaust piping corrections
- Condensate trap and drain components
- Relief valve and expansion support parts
Data-Driven: What Drives Navien Boiler Breakdowns in the Lower Mainland
Why do Navien boilers lock out or throw error codes so often?
Most Navien boiler repair calls we see are not caused by a single “bad part.” The root cause is usually a system condition that forces the boiler to protect itself:
low system pressure, restricted venting, condensate drainage issues, or unstable flow through the heat exchanger. When we correct the condition and confirm proper combustion and circulation,
error codes stop repeating and the boiler runs steady.
- Pressure loss from small leaks, relief valves, or weak expansion support
- Air in the system causing poor circulation and noise
- Venting or intake restrictions that impact safe ignition
- Condensate traps or drains backing up in cold snaps
- Dirty hydronic loops or strainers affecting flow
- Stable operating pressure at temperature
- Correct flow through the heating circuit
- Clean, safe venting and combustion air supply
- Reliable ignition sequence without retries
- Consistent heat delivery across zones
Related Boiler Brand Repair Pages
If your home uses a different boiler brand, use the matching brand repair page so you get the right parts, fault patterns, and model-specific troubleshooting.
Rinnai Boiler Repair
Triangle Tube Boiler Repair
Weil-McLain Boiler Repair
Bosch Boiler Repair
Not sure which brand you have? Send a quick photo of the rating plate through our contact page and we’ll point you in the right direction.
Why Choose Efficient Heating Service for Navien Boiler Repair
- We diagnose first, then recommend parts
- We work clean and protect your home
- We explain the fault in plain language
- We focus on long-term stability, not quick resets
- Experience with Navien hydronic and combi systems
- Clear scope and pricing guidance before work starts
- Safety-first checks on venting and combustion basics
- Local service across the Lower Mainland
Need help fast? Call 778-798-4343 or book through our contact page.
Navien Boiler Repair FAQ
Why is my Navien boiler showing an error code but still sometimes heats?
Many faults are intermittent at first. A weak sensor reading, unstable pressure, restricted venting, or a condensate issue can trigger a lockout only under certain conditions.
A proper repair confirms the fault and the conditions that trigger it.
What causes pressure drops on a Navien boiler system?
Small leaks, relief valve seepage, air removal issues, or expansion problems can all drop pressure over time.
We look for the cause before recommending any part replacement.
Can a blocked condensate drain stop a Navien boiler from running?
Yes. Condensing boilers rely on a clear condensate path. If the trap or drain backs up, the unit may shut down to protect itself.
This is common during cold weather when drains freeze or clog.
Is it worth repairing a Navien boiler or should I replace it?
It depends on age, heat exchanger condition, parts cost, and how often it has been locking out.
We’ll give you a straight answer on repair value and, if needed, point you to our boiler installation option.
Why does my Navien combi have hot water temperature swings?
Flow stability matters. Sensor issues, scale buildup, or diverter/flow components can cause swings.
We test flow and temperature response before we call it a parts issue.
Do you use OEM parts for Navien repairs?
When a part is required, we match the correct component to the model and the confirmed fault.
We also correct the condition that caused the failure so it doesn’t repeat.
What should I do before the technician arrives?
Make sure the area around the boiler is accessible and note any error codes and when the problem happens.
That history helps us diagnose faster and avoid unnecessary part swaps.
Book Your Navien Boiler Repair
If your Navien boiler is locking out, losing pressure, or struggling to heat your home, we’ll diagnose the issue and fix it the right way.
Call 778-798-4343 or request a booking online.