Ruud 13 Error Code

What does Ruud 13 mean?

On Ruud RUTGH condensing tankless water heaters, error code 13 indicates the gas service has been interrupted. The burner cannot fire without a gas supply, so when the controller detects no gas delivery — for example during a utility outage or supply interruption — it displays code 13.

Symptoms

• 13 shown on the remote control LED display
• Burner fails to ignite
• No hot water
• Other gas appliances may also be without gas

Common causes

• Gas service interrupted by the utility
• Gas supply to the building shut off
• Upstream gas outage or meter issue

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Diagnostic steps

1. Confirm the gas outage

   Check whether other gas appliances in the building also lack gas, which points to an interrupted gas supply rather than a unit fault.

2. Contact your gas utility company

   The manual's solution for code 13 is to contact your gas utility company to restore service.

3. Restart after gas is restored

   Once gas service returns, turn off the faucets, turn the heater off, then turn on a hot water faucet and recheck the display. If it persists, unplug for about 30 seconds, plug back in, and restart.

4. Call for service if the code remains

   If 13 stays displayed after confirmed gas supply, note the code and contact a qualified service technician.

When to call a professional

Code 13 is primarily a gas-supply issue to take up with your gas utility. Call a qualified service technician if the code remains after gas service is confirmed restored. If you ever smell gas, the manual directs you not to attempt to find the cause yourself and to follow your gas supplier's emergency instructions; leave repairs to gas piping and safety devices to a qualified professional.