Posts

All the articles I've posted.

• Trane Furnace 4 Flashes - Causes & Fix

  30 May, 2026

  4 flashes on a Trane furnace means an open limit switch or overheat condition. Most often caused by a dirty filter blocking airflow.

• Bosch EA Error Code - Causes & Fix

  30 May, 2026

  EA means your Bosch tankless water heater fails to ignite. Most often it's a gas supply problem, low pressure, or air in the line.

• Noritz Error Code 11 - Ignition Failure Causes & Fix

  30 May, 2026

  Code 11 means ignition failure: the burner won't light or lights briefly then fails flame detection. Clean the ignition rod first.

• Rinnai Code 12 - Flame Failure & Lost Flame Fix

  30 May, 2026

  Code 12 means flame failure or lost flame. Most often it's low gas pressure, a dirty flame rod, or a venting problem.

• Rinnai Error Code 11 - Causes & Fix

  30 May, 2026

  Code 11 means ignition failure: the burner won't light. Most common fix is cleaning the flame rod and igniter or checking gas supply.

• Navien E003 Error - Ignition Failure Causes & Fix

  30 May, 2026

  E003 means your Navien tankless heater can't ignite the burner. Most often caused by low gas pressure, closed gas valve, or bad igniter.

• Rheem Tankless Error Code 12 - Causes & Fix

  30 May, 2026

  Code 12 means no flame detected during ignition. Check gas supply first, then clean or replace the flame sensor and igniter.

• Goodman Furnace 4 Flashes - Causes & Fix

  30 May, 2026

  Goodman 4-flash code means the high-limit switch opened due to overheating. Most common fix: replace the air filter and check airflow.

• York Furnace 7 Flashes - Causes & Fix

  30 May, 2026

  York 7 flashes means low flame sense or ignition lockout. Most often a dirty flame sensor or clogged burner. Clean the sensor first.

• Rheem Furnace 2 Flashes - Causes & Fix

  30 May, 2026

  Rheem 2-flash code means pressure switch stuck closed. Usually caused by failed switch, blocked tubing, or vent restriction.

• Trane Furnace 2 Flashes - Causes & Fix

  30 May, 2026

  2 flashes on a Trane furnace means ignition lockout or failure to sense flame. Most common fix: clean the flame sensor rod.

• Goodman Furnace 1-Flash Error Code - Causes & Fix

  30 May, 2026

  1-flash code means ignition or flame failure. Most often caused by dirty flame sensor or weak igniter. Check gas supply and clean sensor.

• Carrier Furnace Error Code 14 - Causes & Fix

  30 May, 2026

  Error 14 means ignition lockout after repeated flame failures. Most often a dirty flame sensor or failed igniter stops the furnace.

• Carrier Error Code 34 - Ignition Proving Failure Fix

  30 May, 2026

  Code 34 means the Carrier furnace tried to light but the board didn't sense flame. Clean or replace the flame sensor first.

• Honeywell Thermostat E1 Error Code - Causes & Fix

  30 May, 2026

  E1 means replace the thermostat on TH1100/TH1110/TH1210 models. On other Honeywell units it signals a sensor or setup fault. Check wiring first.

• Lennox E250 Error Code - Causes & Fix

  30 May, 2026

  E250 means the limit switch circuit is open. Usually caused by blocked airflow or a failed limit switch. Check filter and airflow first.

• Trane Furnace 5 Flashes - Causes & Fix

  30 May, 2026

  5 flashes means flame sensed when gas valve is off. Usually a dirty or grounded flame sensor. Clean or replace the sensor to fix it.

• American Standard Furnace 4 Flashes - Causes & Fix

  30 May, 2026

  4 flashes means an open high-limit or roll-out switch. Most often caused by a clogged air filter or blower problem restricting airflow.

• Navien E012 Error Code - Causes & Fix

  30 May, 2026

  E012 means flame loss during operation. Most common fix: check gas pressure and clean or replace the flame rod sensor assembly.

• Yaskawa GA800 E28 Fault - Serial Watchdog Timeout Fix

  30 May, 2026

  E28 on Yaskawa GA800 means serial interface watchdog timeout. Drive lost control data from PLC or controller. Diagnose comms and restore link.

• Yaskawa GA800 E25 Fault - Causes & Fix

  30 May, 2026

  E25 on a Yaskawa GA800 means main circuit power establishment error. Learn causes, diagnostic steps, and when to call support.

• Yaskawa GA800 E24 Fault - Causes & Fix

  30 May, 2026

  E24 on a Yaskawa GA800 indicates external 24 V control power is present while main circuit power has dropped out or is absent.

• Yaskawa GA800 E23 Fault - Causes & Fix

  30 May, 2026

  Yaskawa GA800 E23 fault means the external regenerative braking resistor is disconnected or incorrectly wired. Fix by inspecting and repairing the resistor circuit.

• Yaskawa GA800 E22 Fault Code - Causes & Fix

  30 May, 2026

  E22 is not a standard Yaskawa GA800 fault code. Learn how to verify the actual code, reset the drive, and contact support with the right info.