BOILER repairs
Boiler Repair in Marin & Sonoma Counties
Local Plumbing - Licensed Boiler & Hydronic Heating Specialists
If your boiler won’t fire, is making noise, or you’ve lost heat or hot water, Local Plumbing provides same-day boiler repair throughout Marin, Sonoma, and Napa. We repair all major boiler brands, including Navien, NTI, Lochinvar, HTP, Laars, Triangle Tube, IBC, Noritz, and Rinnai.
Why Homeowners Choose Local Plumbing for Boiler Repair
Boiler and hydronic heating systems require true technical expertise. Our team services boilers weekly across Marin and Sonoma — from Mill Valley hillside radiant homes to San Rafael multi-zone systems to Petaluma combi boilers.
We repair:
- High-efficiency wall-hung condensing boilers
- Tank-style boilers
- Combi boilers (space heat + domestic hot water)
- Radiant floor heating systems
- Manifolds, actuators, and mixing valves
- Circulator pumps & zone valves
- Indirect water heater loops
If it heats water or warms your home, we fix it.
Common Boiler Problems We Repair
- Boiler not firing
- No heat upstairs / uneven heating
- Boiler shutting off randomly
- Loud banging, whistling, or rumbling
- Radiant floors staying cold
- Pump running but no heat
- Slow hot water
- Leaking boiler or relief valve discharge
- Burning or electrical smell
- Boiler error codes or fault lights
Brands & Systems We Service
This page now includes every major boiler brand found in Marin & Sonoma homes.
Navien
NCB-E • NFC • NPE-A2 combi
Common issues: ignition failure, E003, flame loss, fan faults, scale buildup
NTI
TRX • TFT series
Common issues: air pressure switch faults, ignition lockouts, low system pressure
HTP
UFT • Munchkin • Versa Hydro
Common issues: F09/F10 faults, blower issues, sensor failure
Lochinvar
Knight KBN • WHN
Common issues: flame signal issues, blocked venting, condensate problems
Laars
Mascot • Neotherm
Common issues: low flow, fan problems, control board issues
Triangle Tube
Prestige • Instinct
Triangle Tube units are extremely common in radiant heating systems across Mill Valley, Tiburon, and Fairfax.
Common issues:
- Internal pressure sensor failures
- Ignition lockout
- Flow-related shutdowns
- Leaks at the fire-tube heat exchanger unions
IBC
SL Series • VX Series
IBC boilers are well-loved locally for their reliability and quiet operation.
Common issues:
- Failed thermistors
- Control board faults
- Insufficient flow through primary/secondary loops
- Fan speed errors
Noritz
NRCB Combi
These systems are popular in remodels and smaller homes.
Common issues:
- Ignition failures
- Three-way valve problems
- Domestic hot water temperature swings
- Scale buildup in plate heat exchangers
Rinnai
E-Series • Q-Series • i120/i150
Rinnai boilers are extremely common in Petaluma and Novato homes.
Common issues:
- Fan motor failure
- Flow sensor errors
- Code 10 venting issues
- Temperature fluctuation during domestic hot water demand

If your boiler brand isn’t listed here, we still repair it — these are just the most common units we service in the North Bay.
How We Diagnose Boiler Problems
Our technicians follow a consistent, thorough diagnostic method:
1. Safety & Combustion
- Gas pressure check
- Ignition and flame signal testing
- Sensor and flame rod inspection
- Intake/exhaust vent inspection
- Condensate line & trap check
2. Hydronic Flow & Circulation
- Circulator pump testing
- Zone valve operation
- Radiant manifold and actuator testing
- Air purge
- Primary/secondary loop inspection
- Strainer and check-valve inspection
3. System Pressure & Expansion
- Expansion tank testing
- System PSI verification
- Relief valve inspection
4. Controls & Electrical
- Thermostat and call-for-heat testing
- 24V transformer check
- Zone valve end-switch testing
- Relay and control board diagnostics
This process identifies the root cause of boiler issues quickly and accurately.
Boiler Repair Pricing**
- Standard boiler repair: $350–$680
- No-heat/ignition repair: $385–$850
- Circulator pump replacement: $1050–$1,800
- Expansion tank replacement: $380–$750
- Zone valve repair/replacement: $300–$900
- Radiant heat loop purge: $450–$900
- Boiler cleaning & descale: $385–$750
- Triangle Tube / Lochinvar annual service: $850–$1350
**Pricing depends on boiler type, design, and diagnostic findings.
Local Repair Examples
Mill Valley — NTI TRX Not Firing
Cause: Air-locked loop, failed AAV
Fix: Purged radiant zone, replaced air vent
Cost: $385
San Rafael — Navien NFC Shutting Off
Cause: Dirty flame rod & blocked intake
Fix: Cleaned and reset system
Cost: $450
Petaluma — Lochinvar Knight Leaking
Cause:
Failed expansion tank
Fix:
Replaced tank, restored pressure
Cost:
$580
Tiburon — Triangle Tube Prestige Cycling On/Off
Cause: Faulty pressure sensor
Fix: Replaced sensor, flushed system
Cost: $520
Novato — IBC SL Series No Heat
Cause:
Failed thermistor
Fix: Replaced sensor, tested combustion
Cost: $410
Service Areas
Marin County: San Rafael, Mill Valley, Tiburon, Larkspur, Sausalito, Fairfax, Corte Madera, San Anselmo, Novato
Sonoma County: Petaluma, Cotati, Rohnert Park, Sonoma, Glen Ellen, Penngrove
Napa County: Napa, American Canyon
Boiler Repair FAQ
Why won’t my boiler fire?
Common causes include ignition failure, blocked venting, dirty flame rod, low gas pressure, bad pump, or low system pressure.
Why are some rooms cold while others are warm?
Usually air in the system, a failing circulator pump, or a stuck zone valve.
My boiler is making banging or whistling noises — what does that mean?
Air in the lines, kettling (scale buildup), or a failing pump.
My boiler is leaking — is it dangerous?
Yes. Shut it down and call us. Leaks can drop pressure, trigger shutdowns, and damage internal components.
Do you repair radiant heated floors too?
Yes — we repair manifolds, mixing valves, actuators, and air issues.
Book Boiler Repair Today
Local Plumbing provides fast, reliable boiler repair across Marin, Sonoma, and Napa.
- Licensed boiler and hydronic technicians
- Same-day service available
- Local experts based in Sausalito & Petaluma
Call, text, or book online - we’ll restore your heat and hot water quickly.
