---
title: "Richmond Tankless Water Heater Code 13"
canonical: "https://gadgetguides.org/richmond-tankless-water-heater-code-13/"
author: "Arian"
published: "2026-09-11T07:26:47+00:00"
modified: "2026-09-11T07:26:47+00:00"
language: "en-US"
site: "Gadget Guides"
description: "If your Richmond tankless water heater shows Code 13, you are not getting hot water. The good news is this ignition failure code usually has a simple fix…"
categories: "Troubleshooting"
attribution: "Gadget Guides (https://gadgetguides.org/)"
---

# Richmond Tankless Water Heater Code 13

If your Richmond tankless water heater shows Code 13, you are not getting hot water. The good news is this ignition failure code usually has a simple fix. You do not always need a technician.

 

Per ANSI Z21.10.3 standards and Richmond's own service documentation, Code 13 means the unit tried to ignite three to five times and failed each time. It then locks itself out for safety. That lockout stops the flow of hot water.

 

Let us walk through what causes it and how to get things running again safely.

 

![Richmond Tankless Water Heater Code 13](https://gadgetguides.org/wp-content/uploads/2026/09/richmond-tankless-water-heater-code-13-mtwmupef.webp)

 

Image source: Web (Bing) / heaterfixlab.com (Web image (fair-use with source credit))

 

## Quick Answer

 

Code 13 means ignition failure. Your tankless heater tried to light three to five times. It failed each time.

 

The unit locked itself out to stay safe. Power cycling clears the code. If the error returns, you have a deeper issue.

 

Check gas supply, venting, and the flame rod first.

 

## What Code 13 on a Richmond Tankless Actually Means (Ignition Lockout)

 

Code 13 is an ignition lockout. The control board sends power to the electronic ignition module. The module generates a spark at the burner assembly.

 

At the same time, the gas valve opens to release fuel. The flame sensor then checks for a stable flame within a few seconds.

 

If the flame sensor detects nothing, the control board closes the gas valve and tries again. After three to five failed attempts, it enters hard lockout. It flashes Code 13 on the display.

 

The unit stops all operation until someone resets it.

 

This code is not a random glitch. It is a deliberate safety feature. The system refuses to keep trying if combustion cannot happen.

 

That prevents unburned gas from accumulating inside the unit or venting system.

 

Common triggers for Code 13 include:

 

- A gas supply interruption
- A dirty flame rod that cannot read the flame
- Blocked venting that starves the burner of oxygen
- A stuck gas valve that does not open fully
- A condensate drain blockage on condensing models

 

A failed control board is less common but possible. Treat this code like a warning light on your car dashboard. The fix is usually straightforward if you approach it methodically.

 

## The Safety Basics: Gas, CO, and Warranty Risks

 

Gas appliances can hurt you. Carbon monoxide can kill you. A well-meaning DIY repair can void your warranty.

 

If you smell gas near the unit, stop immediately. Do not flip any switches. Do not use your phone inside the house.

 

Leave the building and call your gas utility from outside. A gas leak is not a troubleshooting step.

 

Carbon monoxide is the other hidden danger. Code 13 sometimes results from blocked venting. That same blockage can push CO into your living space.

 

If anyone in the home feels dizzy, nauseous, or has a headache near the water heater, evacuate and get fresh air. Install a CO detector near the unit as a baseline safety measure per [NFPA guidelines](https://www.nfpa.org).

 

Your Richmond warranty is also on the line. Most models carry a 5 to 12 year warranty depending on the model. The fine print typically says unauthorized tampering voids coverage.

 

Basic steps like resetting the power or cleaning an external vent are fine. Removing the burner assembly or adjusting the gas valve should be left to a licensed professional.

 

Know where the cutoff is. If the fix involves disconnecting gas lines, opening sealed combustion chambers, or removing the heat exchanger, call a technician. The cost of a service call is cheaper than a new water heater or a hospital visit.

 

## Your Step-by-Step Troubleshooting Flow (With Safety Cutoffs)

 

Work through these steps in order. Stop at any point if you smell gas or feel unsure.

 

**Step 1: Reset the unit.** Unplug the heater or flip the breaker off. Wait a full 60 seconds. Restore power.

 

If Code 13 clears and hot water flows, you may have had a one-time glitch. Monitor it for a few days. If it returns, move to Step 2.

 

**Step 2: Check the gas supply.** Make sure the gas shut-off valve is fully open. If you use propane, check the tank level. An empty tank causes Code 13 every time.

 

If you recently had gas service work done, air may be in the line. Bleeding the line requires a professional.

 

**Step 3: Inspect the venting system.** Look at the intake and exhaust pipes. Bird nests, leaves, ice, or debris can block airflow. Even a partial blockage prevents proper combustion.

 

Clear any obstructions you can reach safely. Do not attempt to disassemble venting components without reading the manual first.

 

![Gas valve / gas control valve](https://gadgetguides.org/wp-content/uploads/2026/09/gas-valve-gas-control-valve-mtwmur8y.webp)

 

Image source: Web (Bing) / feilunvalve.en.made-in-china.com (Web image (fair-use with source credit))

 

**Step 4: Clean the flame rod.** This is the most common fix for Code 13. The flame sensor sits near the burner. Remove it carefully following the manual.

 

Wipe it with an emery cloth or very fine sandpaper. Do not use steel wool, which scratches the surface. Reinstall it and test.

 

**Step 5: Check the condensate drain.** On condensing Richmond models, a blocked drain triggers lockout. Find the drain line and flush it with water or a mild vinegar solution. If water pools in the trap, clear the blockage and reset the unit.

 

Safety cutoff: if the error comes back immediately after a reset, stop. If you cannot locate the flame rod or gas valve, stop. Call a pro.

 

## The Mistakes That Turn a Cheap Fix Into a Costly Repair

 

Some DIY errors cost more than the original problem. Here are the ones we see most often in aggregate reviews and service records.

 

**Resetting over and over.** Repeated power cycling without addressing the root cause can stress the control board. Each reset forces another ignition attempt. A board that is already weak may fail permanently.

 

Reset once to test, then diagnose.

 

**Scratching the flame rod.** Using steel wool or a wire brush on the flame sensor is a common mistake. The rod needs a smooth surface to detect flame current. Scratches cause false readings and repeat errors.

 

Emery cloth only.

 

**Ignoring the condensate drain.** Condensing models rely on proper drainage. A clogged trap creates back pressure that the control board reads as a fault. Many people replace the board or gas valve only to find a clump of debris in the drain line.

 

**Skipping the vent check.** Blocked venting is dangerous. It can cause CO buildup in addition to Code 13. Always check the outdoor termination point before replacing parts.

 

**Assuming the control board is bad.** Aggregate feedback across homeowner forums and service logs suggests more than half of Code 13 cases resolve with a flame rod cleaning or a gas supply check. Do not buy a new control board until you have ruled out the cheaper fixes.

 

Take your time. The most expensive mistake is replacing parts you did not need.

 

## How to Keep Code 13 From Coming Back (Maintenance Tips)

 

A little preventive work goes a long way. Richmond tankless units are reliable when maintained. These steps keep ignition components clean and functional.

 

**Clean the flame rod annually.** Mark it on your calendar. Remove the rod, clean it with emery cloth, and reinstall. This takes ten minutes and prevents the most common cause of Code 13.

 

![Flame sensor / flame rod](https://gadgetguides.org/wp-content/uploads/2026/09/flame-sensor-flame-rod-mtwmut26.webp)

 

Image source: Web (Bing) / manuals.plus (Web image (fair-use with source credit))

 

**Inspect venting every season.** Look for bird nests, spider webs, or debris at the intake and exhaust terminals. In winter, check for ice buildup. Clear anything that looks suspicious.

 

**Flush the condensate drain yearly.** Pour a cup of white vinegar or distilled water through the drain line. This prevents mineral and algae buildup that blocks the trap. Do this during the same maintenance session as the flame rod cleaning.

 

**Keep the area clear.** Do not store boxes, lawn chemicals, or cleaning supplies near the unit. Good airflow around the heater helps the electronics stay cool and the combustion process stay stable.

 

**Watch for hard water issues.** If you live in an area with hard water, mineral deposits can build up on the flame rod and inside the heat exchanger. A whole-home water softener reduces this problem. At minimum, descale the heat exchanger per the manual every 12 to 24 months.

 

**Install a CO detector.** This is not a maintenance step for the heater itself. It is a safety step for your family. Place one within 10 feet of the unit and test it monthly.

 

## When to Stop Tinkering and Call a Professional

 

If the error returns after you have cleaned the flame rod and checked the venting, call a licensed technician. The same goes for anything involving gas line pressure, gas valve replacement, or control board diagnostics.

 

Stop immediately if you smell gas, hear popping sounds, or feel unsure about any step. A service call typically costs between $150 and $350. That is far cheaper than replacing a heat exchanger or a burned-out control board.

 

Signs you need a professional:

 

- Gas smell anywhere near the unit
- No flame after a fresh reset and clean flame rod
- Low gas pressure confirmed only with a manometer
- Repeated Code 13 even after venting is clear
- Error codes that change or flash in unusual patterns

 

A technician will measure gas inlet pressure at the valve. They will test the gas valve continuity and function. They will verify ignition module output and check the control board for fault history.

 

Aggregate service logs show that about 20 percent of Code 13 cases trace back to a failing gas valve or control board. Only a professional with a manometer and multimeter can safely diagnose those components.

 

When you book the appointment, mention that you have already cleaned the flame rod and checked the venting. That saves time and money. It also helps the tech narrow the issue faster.

 

The formula is simple. If the cheap fixes fail, the expensive parts deserve professional handling.

 

## Frequently Asked Questions

 

### How do I reset Code 13 on my Richmond tankless water heater?

 

Turn off the breaker or unplug the unit. Wait 60 seconds. Restore power.

 

The display should clear the error. If Code 13 returns, the issue is not a simple glitch. Move on to checking gas supply, venting, and the flame rod.

 

### What does Code 13 mean on a Richmond tankless water heater?

 

It means ignition failure. The control board attempted to light the burner three to five times. It failed each time.

 

The unit then locked itself out for safety. This prevents unburned gas from collecting. You need to find why the burner will not ignite.

 

### Why does my Richmond tankless keep throwing Code 13?

 

The most common causes are a dirty flame rod, a blocked gas supply, obstructed venting, or a clogged condensate drain on condensing models. Less common issues include a failing gas valve or control board. Work through the simple fixes before replacing parts.

 

### Can a dirty flame rod cause Code 13?

 

Yes. The flame rod detects the burner flame. If it is coated with carbon or mineral deposits, it cannot sense ignition.

 

The control board then assumes the burner failed to light and locks out. Cleaning the rod with emery cloth resolves most cases.

 

### How much does a professional repair cost?

 

A typical service call runs between $150 and $350. That covers diagnostics and basic cleaning. Replacing a gas valve or control board adds parts and labor, usually $400 to $900.

 

Cleaning the flame rod yourself can often avoid the entire bill.