Bradford White RG240T6N Problems & Error Codes — Overview
The Bradford White RG240T6N is a 40-gallon atmospheric gas water heater that uses an LED flash code on the gas control valve to signal faults, not a digital display. The most frequent service issue on this model is gas valve lockout indicated by seven or eight flashes on the control, which typically points to a failed gas control module. Basic troubleshooting starts with reading the flash pattern on the valve, checking that the pilot is lit, and confirming line power before moving to component replacement. Bradford White’s service manual directs technicians to verify 110–120 volts at control board primary pins 1 and 3, and 24 volts on the secondary circuit when diagnosing electrical faults.
Most Common Problems on This Model
- Seven or eight flashes on gas valve Gas control valve has failed internally or the control circuit has lost signal, and Bradford White training identifies these flash codes as gas valve faults requiring gas valve replacement.
- Pilot flame goes out or will not stay lit Pilot assembly is fouled, thermocouple or flame sensor is weak or dirty, or gas supply pressure is low, and the fix is cleaning or replacing the pilot assembly and verifying gas pressure.
- No hot water and no flame present Gas supply is turned off at the valve, line power is interrupted at the breaker or receptacle, or the gas control valve is locked out, and the technician verifies gas flow, resets the breaker, and checks for fault codes.
- Burner lights then shuts off before heating cycle completes High limit switch has tripped due to overheat, water temperature sensor circuit is open or reading incorrectly, or the gas valve is cycling on fault, and the repair involves testing the sensor resistance against the temperature chart and replacing the limit or sensor if out of spec.
- No power to control or no LED flash at all Line cord, plug, receptacle, breaker, or internal fuse is open, or the control board transformer has failed, and the technician checks for 110–120 volts at the primary side and repairs the power supply path or replaces the board.
- Intermittent hot water or burner cycling Water temperature sensor is reading drift or has corroded connections, or the gas valve is starting to fail and causing erratic flame modulation, and the fix is cleaning sensor terminals and replacing the sensor or valve as isolated by resistance and voltage tests.
- Gas smell or visible corrosion at valve or pilot assembly Gas fitting is loose, pilot tubing is cracked, or the gas valve body has corroded and is leaking, and a licensed gas technician must perform a full leak test, tighten fittings, and replace any leaking component immediately.
Parts That Commonly Fail
| Part | Notes |
|---|---|
| Gas control valve | Amazon | Fails with 7 or 8 flash codes and is the most common replacement on the RG240T6N. |
| Pilot assembly (thermocouple and burner) | Amazon | Fouls from combustion deposits or fails electrically, preventing pilot flame from staying lit. |
| Water temperature sensor | Amazon | Drifts out of resistance spec or corrodes, causing erratic cycling or lockout. |
| High limit switch | Amazon | Trips on overheat and will not auto-reset, requiring manual reset or replacement if contacts are welded. |
When to Call a Pro
Call a licensed plumber or gas technician for any work involving gas line connections, gas valve replacement, pilot assembly service, or leak testing. If you smell gas, shut off the gas supply at the valve immediately, leave the area, and call your gas utility or a qualified technician. Electrical diagnostics that require measuring voltage at the control board, testing sensor resistance, or replacing the gas control valve are best handled by a trained service tech familiar with Bradford White atmospheric gas water heaters and the specific flash-code troubleshooting paths in the service manual. For gas line, burner, or igniter work, or if you ever smell gas, stop and call a licensed technician.