How To Fix Navien Tankless Water Heater Error Code 736 (How To Troubleshoot Error 736 Easily)

Описание: How To Fix Navien Tankless Water Heater Error Code 736 (How To Troubleshoot Error 736 Easily). In this video tutorial I will show you how to fix Navien Tankless Water Heater Error Code 736.

The 736 error code indicates a cascade communication problem.
The following are the common causes of the error code;
• System glitch.
• Incompatible PCB model.
• Incorrect cascade connection.

Now, Let’s Look at the Best Solutions to Fix the Error:
Reboot the water heater.
The error could occur due to a system glitch, and you'll have to do a hard reset on the appliance. Here's how to do it;
• Turn off and disconnect the water heater from the socket.
• Let it rest for 5-10 minutes.
• Plug it back into the socket and turn it on.

Check PCB unit compatibility.
• Unplug the water heater from the power source.
• Remove the covering panel to access the PCB unit and the connecting cables.
• Check if the PCB model is compatible with the communication cable.
• If not, replace either of them to be compatible with the other.
• Reassemble and test the water heater.

Inspect the cascade communication.
• Ensure the water heater is receiving enough power supply.
• Test the circuit breaker for continuity and inspect it for damage.
• Inspect the cascade communication line for damage.
• Check for loose, frayed, burnt, or corroded wires.
• Replaced damaged wires with new ones.
• Reassemble the water heater and test it.
If the machine is still not working, contact a professional for further guidance.


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