♨️Water Heaters Error Codes
Tankless and tank water-heater error codes. Ignition, flame-rod, flow-sensor and venting faults, and the parts that fix them across Rheem, Navien, Rinnai, A.O. Smith, Bosch and Noritz. Gas and venting work is flagged pro-recommended.
203 guides · Top brands: Rheem, Navien, Rinnai, Bosch
Section editor: James Rutherford · Master Plumber
Recent Water Heaters Guides
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A.O. Smith Water Heater High-Limit Switch/ECO Replacement
No hot water or tripped reset button means the high-limit switch has shut off power. Replacing the upper thermostat/ECO assembly restores safe heating.
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Bradford White Water Heater High-Limit Switch (ECO) Replacement
No hot water after the ECO trips, repeated reset-button presses needed, or warm water only. Replacing the upper thermostat/ECO assembly restores heat and safety lockout protection.
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Rheem Water Heater High-Limit Switch / ECO Replacement Guide
Heater won't run after lockout, power cycle doesn't clear fault, or ECO trips repeatedly. Replacing the upper thermostat / ECO assembly restores operation.
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Bradford White Water Heater Drain Valve Replacement - Signs & How-To
Leaking, clogged, or stuck drain valve at the bottom of your Bradford White tank stops flushing and drips water. Replacing the brass valve restores normal operation.
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Rheem Water Heater Drain Valve Replacement - Signs & How-To
A leaking, cracked, or seized drain valve at the tank bottom won't drain properly or drips constantly. Replace it with a brass upgrade.
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A.O. Smith Water Heater Drain Valve Replacement - Signs & How-To
Leaking or stuck drain valve at tank bottom. Replace it to stop drips and restore full drainage for flushing sediment and tank service.
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Bradford White Water Heater Dip Tube Replacement - Signs & How-To
Weak hot water, plastic bits in water, and fast hot water depletion mean a broken dip tube. Replacing the inlet nipple/dip tube restores flow.
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Rheem Water Heater Dip Tube Replacement - Signs & How-To
Lukewarm water or hot runs out fast? The cold-water dip tube inside your Rheem heater likely cracked. Replacing it restores proper heating.
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Navien Tankless Heat Exchanger Replacement - Signs & How-To
Boiling/overheating faults, E001/E055 codes, poor hot water flow, and scale buildup mean your secondary heat exchanger is clogged or damaged. Replacing it restores performance.
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Rheem Tankless Water Heater Secondary Heat Exchanger Replacement
Low outlet temp, error 29, water leaks, poor hot water flow, and visible corrosion mean your secondary heat exchanger has failed. Replacing it restores proper heating and clears the fault.
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Rinnai Tankless Heat Exchanger Replacement - Signs & How-To
Overheating codes, scale buildup, inconsistent hot water, and persistent error 14 mean your Rinnai heat exchanger is blocked or failing. Replacing it restores performance.
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Rheem Tankless Water Heater Control Board Replacement Guide
Persistent error codes, ignition failures, no heating, or unresponsive controls mean your PCB is faulty. Replacing the control board restores normal operation after you rule out sensors and wiring.
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