One of the most common problems of all water heaters - they won’t light. There are many different causes, one of the most common - thermocouple. The thermocouple detects the pilot flame. If the thermocouple does not detect a flame, the ignition process will stall, and the burner will not light. In this case, you must replace it. Don’t worry, is one of the easiest repairs and doesn't take much time. Let’s start.
Turn off the gas supply. Make sure that the gas controller is in the off position before attempting this repair. Unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve. The burner typically sits loosely — or under clips — in the burning chamber and just slides out. Detach the thermocouple from the burner. The thermocouple is usually attached to the pilot gas supply tube with one or more clips that snap into place. The end of the thermocouple is inserted into the pilot assembly and can simply be pulled out. Take the detached thermocouple with you to the home center or hardware store and buy a new one. Install the new one the same way that you removed the old one. Attach the end of the new thermocouple into the pilot assembly and reattach the thermocouple to the pilot gas supply using the clips previously removed, reinstall the burner and, using a small open-end or adjustable wrench, reconnect the thermocouple lead, the gas tube to the main burner, and the pilot gas tube to the valve. Turn the gas back on and follow the lighting instructions on the water heater. Check for gas leaks by applying soapy water to joints and looking for bubbles while the main burner is firing.
Solved! Problem is gone. Furnace must work in normal mode. Feel difficulties during replacing - you can contact our customer support team and arrange an appointment at the convenient time
