Error C4 Heater Bosch

What is the fault of Bosch Error C4 affecting your heater?

Water heaters are very useful and necessary devices in the home, but they can also experience some problems or faults that affect their operation. One of these issues is the Error Code C4, which is displayed on the heater's screen when there is an anomaly in the electrical system or the fan.

In this article, we will explain what this error code might signify, what its possible causes are, and how we will find a simple and safe solution. This way, you can enjoy your water heater without inconvenience and with the highest possible efficiency.

Error Code C4 indicates that there is a problem with the differential relay or the pressure switch of the heater. These are two components responsible for regulating the airflow and gas pressure in the appliance. If either of them fails, the heater cannot ignite or it automatically shuts off, displaying Error Code C4 on the screen.

Among the possible causes that may lead to Error Code C4 appearing on your screen are the following:

• The differential relay does not open when the fan is active: This may be due to a defect in the relay, poor electrical connection, or a short circuit in your heater.
• The pressure switch does not detect the proper gas pressure: This could result from an obstruction in the gas exhaust duct, a gas leak, or a defect in the pressure switch.
• The fan is not functioning correctly: This may be due to an accumulation of dirt, wear on the blades, an issue with the motor, or an electrical failure.

How to fix Bosch water heater Error C4?

But this problem has a solution! You just have to follow the steps we outline below, and you'll likely be able to fix Bosch Error Code C4 on your water heater:

1. Restart the heater to refresh the sensors: Turn off the heater's main switch, disconnect it from the power outlet, and wait a few minutes before reconnecting and turning it back on. This effectively restarts your heater and can resolve the issue if it's a specific or temporary failure.
2. Check the differential relay and its connections: Ensure that the relay is in good condition and that there are no loose or damaged wires. Use a multimeter to verify that the relay is indeed functioning correctly. If necessary, replace the relay with a new one or repair any damaged or poorly connected wires.
3. Inspect the pressure switch and its connections: Verify that the pressure switch is in good condition and that there are no loose or damaged wires. Use a multimeter to check its operation. If necessary, replace the pressure switch with a new one or repair any damaged or poorly connected wires.
4. Check the gas exhaust duct on your heater: Ensure that this duct does not have any obstruction or leaks in the tube that expels the heater's gases to the outside. If necessary, clean the duct or repair any leaks. Typically, this pipe tends to accumulate cobwebs, insects, or wooden sticks from birds attempting to nest in the duct. Remove anything that might be obstructing the gas outlet and clean everything thoroughly.
5. Inspect the fan and its connections: Check and ensure that the fan is clean and can spin freely. If necessary, clean the fan with a damp cloth, being careful not to apply too much force to the blades. If you use a compressed air blower to clean the fan, make sure not to let it spin with the air you're applying; hold it by hand and blow forcefully to remove dust and dirt from the blades.
6. Repeat all the above steps and make sure to follow everything to the letter if the problem persists: You may need to go through everything again if the problem persists. Please make sure to follow all the steps precisely and don't overlook anything. If the problem still persists, then your heater may have a more serious issue than initially thought.
7. Request an inspection of your heater with Bosch technical support: If, after performing all the above checks and repairs, Bosch Error Code C4 continues to appear on your heater's screen, it's best to contact a qualified professional to inspect your heater and repair it if necessary. We are confident that Bosch's technical service is the right choice for this task. They will provide you with a prompt and appropriate solution to fix the problem with your heater and offer all possible guarantees.

In summary, to conclude our small guide of tips, Error Code C4 in Bosch water heaters is due to a problem with the differential relay or the pressure switch of the appliance. This issue can hinder the proper functioning of your heater, and its known causes could be a defective relay, a defective pressure switch, and/or a damaged fan or obstructed gas exhaust duct.

To fix Bosch Error Code C4 on your heater, in a nutshell, you should do the following:

• Restart the heater to refresh the sensors
• Check the differential relay and its connections
• Inspect the pressure switch and its connections
• Check the gas exhaust duct on your heater
• Inspect the fan and its connections
• Repeat all the above steps and make sure to follow everything to the letter if the problem persists
• Request an inspection of your heater with Bosch technical support

We hope this article has been helpful, and you've been able to resolve the issue with your Bosch water heater. Remember that Bosch Error Code C4 in heaters is a problem that can be solved. Good luck with the repair, and until next time!