lochinvar boiler error codes

There are a number of Lochinvar boiler error codes. You can use these codes to diagnose problems with your system. In most cases, these codes reflect a relatively simple troubleshooting process. To begin, check to see if the gas valve is receiving 24 volts. If it does, repair or replace the sensor or wiring.


Checking for 24 vac to the gas valve

If you see one of these error codes on your Lochinvar boiler, there’s a good chance that your gas valve is not connected properly. When this happens, the main control board detects the problem and displays the Gas Valve Fail fault. It’s easy to fix this problem.

First, check the Low Voltage Connection Board for a loose jumper or other device plugged across the gas pressure switch terminals. If this does not solve the problem, check the optional flow switch, which senses too much condensate buildup. You can also check the condensate tube from the unit to the floor drain for obstructions.


Checking for damaged sensor or wiring

In some cases, the Lochinvar boiler error codes can reflect a simple problem that can be easily solved. For example, if the gas valve does not seem to be connected to the main control board, then it is likely that the sensor is faulty. This will show up as a Gas Valve Fail fault on the display.

In some cases, the low-water cut-off or the pump motor may be malfunctioning. Check the wiring and sensor, and make sure it is not damaged. If the switch is not working, you can replace or repair it. Similarly, if the 120 vac input to the main control board is too low, check the transformer’s connections and wire size.

Repair or replace if damaged

If your Lochinvar boiler is damaged, it may be time to have it replaced or repaired. This boiler is susceptible to problems with its flue grommets. If the grommets are damaged or missing, you should have a professional repair technician take a look. Additionally, you should install working carbon monoxide alarms on every level of your home. These alarms will tell you if there’s a problem with your boiler.

First, make sure that the boiler is purged of air or water. Then, make sure that the drain switch is not blocked or that the condensate tube is not obstructed. You should also make sure that the flame detector circuit is working properly. If there is no flame, the device will send a signal to the main control board. In addition, the wiring harness must be connected properly.

Another option for repairs is to consult a service agent. Many insurance companies offer equipment breakdown coverage. However, you may have to pay a deductible or copay. Regardless of your coverage, you should still consult a qualified service agent to ensure that your boiler is repaired properly.

Repair or replace if wiring is damaged

The main control board is responsible for controlling the temperature of the boiler. If the temperature sensor is not connected, you may need to replace the unit. The temperature control module can not sense the flame if the gas valve is not connected. If you are unable to detect the flame, check the wiring from the main control board to the gas valve. If you find damage to the wiring, replace the main control board.

A broken or missing wire may cause the boiler to stop heating, which can result in a breakdown of the unit. To correct this problem, make sure that the wiring is connected to both poles of a normally closed switch. Check the voltage of the power supply on both poles of the switch to ensure that it is the correct polarity.


Troubleshooting Lochinvar boiler error codes may sound like a daunting task, but you don’t need to worry. There are a few things you can do to resolve the error. For one thing, it’s very important to ensure the proper functioning of your heating system. If you notice that your heating system is not producing hot water, it may be the fault of your boiler’s circulator. If this is the case, it’s important to replace it.

The first thing to do is to check your Low Voltage Connection Board for any loose jumper or device that is wired across the gas pressure switch terminals. You also need to check the water level and make sure that the system is purged of air. Lastly, check the refractory of the burner to ensure that it’s not cracked. In some cases, the condensate tube can also be obstructed. In addition, check the air pressure switch contacts to make sure that they are not open.

Troubleshooting lochinvar boiler error code scenarios may include the following: – The gas valve has not received any electricity. If the gas valve is not connected, the main control board will detect the issue and display Gas Valve Fail error codes. – The outlet water temperature is greater than the automatic reset high limit.