Posts

All the articles I've posted.

• Lennox E241 Error Code - Causes & Fix

  30 May, 2026

  E241 means flame sensed out of sequence. Clean the flame sensor first-it's the most common fix for this Lennox fault code.

• Lennox E270 Error Code - Causes & Fix

  30 May, 2026

  E270 means gas valve lockout after repeated failed ignitions. Usually a bad igniter or flame sensor. Reset only after finding cause.

• Lennox E206 Error Code - Causes & Fix

  30 May, 2026

  E206 means gas valve second-stage relay failure. Furnace runs on 1st stage only. Fix: check wiring, then replace control board.

• Lennox E205 Error Code - Causes & Fix

  30 May, 2026

  E205 means gas valve control relay contact shorted. Check wiring at the control board and gas valve, then replace the control if wiring is OK.

• Lennox E117 Error Code - Causes & Fix

  30 May, 2026

  E117 means poor ground detected on your Lennox furnace. Check equipment ground and 120V at the control to find the wiring fault.

• Lennox E125 Error Code - Causes & Fix

  30 May, 2026

  E125 means the integrated control board failed its self-check due to internal hardware fault. Most cases need board replacement.

• Bradford White 3 Flashes - Causes & Fix

  30 May, 2026

  3 flashes on a Bradford White gas water heater means a thermal well sensor or gas control fault. Most often the thermal well is damaged.

• Bradford White 5 Flashes Error Code - Causes & Fix

  30 May, 2026

  5 flashes on Bradford White gas water heaters means false pilot flame present. The pilot valve is stuck open and you need a new gas control.

• Navien E109 Error - Causes & Fix

  30 May, 2026

  E109 signals a fan or air-intake fault in your Navien tankless water heater. Most often fixed by cleaning the air filter or fan area.

• Nest Thermostat E74 Error - Causes & Fix

  30 May, 2026

  E74 means no power to the Rh wire. Check your furnace breaker, service switch, thermostat wire connection, and control board fuse.

• Rheem Furnace 4 Flashes - Causes & Fix

  30 May, 2026

  4 flashes means high-limit switch open from overheating. Most common fix: replace dirty air filter and check blower airflow.

• Trane Furnace 3 Flashes - Causes & Fix

  30 May, 2026

  Three flashes on a Trane furnace means a pressure switch fault. Most often caused by blocked vents or water in the switch tubing.

• A.O. Smith E2 Error Code - Causes & Fix

  30 May, 2026

  E2 means over-temperature shutdown on A.O. Smith electric tankless heaters. Most common fix: replace the thermistor sensor.

• A.O. Smith E1 Error Code - Causes & Fix

  30 May, 2026

  E1 on an A.O. Smith tankless water heater means high-temperature shutdown. Most often caused by a faulty sensor or thermostat.

• Bosch E9 Error Code - Causes & Fix

  30 May, 2026

  E9 means the overheat limiter on your Bosch tankless water heater has tripped. Most often caused by scale buildup in the heat exchanger.

• Rinnai Error Code 25 - Causes & Fix

  30 May, 2026

  Rinnai error code 25 means condensate backup has tripped the safety switch. Clear blocked drain lines or check the condensate pump.

• Rheem Tankless Water Heater Error 76 - Causes & Fix

  30 May, 2026

  Error 76 means communication failure between your Rheem tankless heater and its remote control. Check wiring connections first.

• Nest N260 Error Code - Causes & Fix

  30 May, 2026

  N260 means your Nest thermostat isn't getting enough power through the C wire. Fix by adding a C wire or installing a Nest Power Connector.

• Goodman Furnace 2 Flashes - Causes & Fix

  30 May, 2026

  Goodman 2-flash code means pressure switch stuck closed. Usually a failed switch, shorted wiring, or draft problem. Fix guide inside.

• Carrier Furnace Error Code 13 - Causes & Fix

  30 May, 2026

  Code 13 is a limit circuit lockout after the furnace detected an open high-limit or flame rollout for over 3 minutes. Check your filter first.

• Lennox E227 Error Code - Causes & Fix

  30 May, 2026

  E227 means the pressure switch is stuck open or closed. Most common fix: clear blocked pressure tubing or replace the faulty switch.

• American Standard Furnace 2 Flashes - Causes & Fix

  30 May, 2026

  2 flashes means retry lockout after failed ignition or flame loss. Most common fix: clean or replace the flame sensor.

• Rheem Furnace 3 Flashes - Causes & Fix

  30 May, 2026

  Rheem 3-flash code means the limit control circuit is open. Most common fix: replace the dirty air filter to restore airflow.

• Carrier Error Code 31 - Causes & Fix

  30 May, 2026

  Error code 31 means a pressure switch fault. The switch did not close or opened unexpectedly. Check vents and condensate drain first.