Bradford White RG240T6N eF Series 2-FLASH Error Fix: Thermopile Voltage Low

Error code 2-FLASH on the Bradford White RG240T6N eF Series means: Thermopile Voltage Low. The ICON System LED blinks twice, indicating the thermopile is generating insufficient millivoltage (below ~400mV) to hold the gas valve open. The pilot may extinguish or the main burner will not fire. The thermopile is a sensor in the pilot flame that generates electrical power to operate the gas valve — no external electricity is needed. Clean the thermopile with fine sandpaper or emery cloth, making sure the pilot flame is fully engulfing the tip. Check the thermopile wiring connections at the gas valve. If voltage remains below 400mV with the pilot lit, replace the thermopile. Also check that the pilot flame is strong and blue — a weak yellow flame indicates a clogged pilot orifice or air supply issue.

The most successful fix is "Test and Replace Thermopile Sensor" (medium difficulty, ~45 minutes). Estimated DIY cost: $20-$30. HomeMD has 2 community-ranked fixes for this error.

This error is rated high severity. You should address it promptly — continued use could cause damage or safety concerns.

Yes — the top-ranked community fix ("Test and Replace Thermopile Sensor") is rated medium difficulty and takes about 45 minutes. Tools needed: Multimeter (millivolt setting), Fine sandpaper, Adjustable wrench, Phillips screwdriver.

DIY cost: $20-$30. Professional repair typically costs $150-$250. Many homeowners save money by trying the top-ranked community fix first.

The Bradford White RG240T6N eF Series has 8 other known error codes, including: 1-FLASH (Normal Operation — System OK), 4-FLASH (High Temperature / ECO Trip), 5-FLASH (Temperature Sensor Failure), 7-FLASH (Gas Control Valve Electronics Failure), 8-FLASH (Power Interruption / Loss of Pilot Signal), and 3 more.

Error code 2-FLASH also appears on 6 other Bradford White models: D-W-2-75T6BN Ultra Low NOx, MI50S6BN 50 Gallon 76,000 BTU Magnum Series Commercial Natural Gas Water Heater, MI50T6FBN 50 Gallon 40,000 BTU Natural Gas Magnum Commercial Water Heater, RG250T6N 50 Gallon 40,000 BTU 0.67 EF Defender Safety System Gas Water Heater, RG2PV40T6N 40 Gallon 40,000 BTU Power Vent Gas Water Heater with Defender Safety System, RG2PV50H6N 50 Gallon 40,000 BTU Power Vent Gas Water Heater with Defender Safety System. The fix may vary by model, so check each model's specific page for tailored repair steps.