Are there any problems with my Bosch tankless water heater?

If you are the owner of a “smart” tankless water heater from Rinnai, Noritz, Paloma, Bosch, Takagi or similar, this troubleshooting guide is for you. The guide deals with the most common problems and explains some of the error codes.

Where do I find the Bosch instruction manual?

Get familiar with your appliance with Bosch instruction manuals. If you’ve forgotten where you put the manual that came with your appliance, help is on hand. Simply enter the E-NR (model type number) from your appliance and we’ll take you to the available publications.

What to do if your Bosch water heater wont light?

For now make sure the tube that drains water from the side of item 34 is clear, and that the collar is not full of water…and remove the blower assembly and make sure there is no water in that. We can go from there as necessary until we resolve the problem.

What do you mean by the headers in Bosch water heater?

There is no one local that services Bosch water heaters, but Bosch technical support is going to walk them through the diagnostics, etc. What do you mean by the headers? Are there particular parts on the diagram that make up the headers?

How can I troubleshoot my Bosch tankless water heater?

If the tankless water heater develops a problem, troubleshoot it before calling for service. Disconnect the power supply to the water heater before removing the cover. Inspect the water supply. Connect the supply line to the blue inlet on the water heater.

How to get technical support for Bosch water heaters?

Easily identify and troubleshoot your issues with our parts diagrams PDFs. This form is set up for users who have already tried all troubleshooting and still are in need technical support. All labor reimbursement requests must be submitted on the form provided. This handy guide identifies the various locations of product serial numbers.

Why is the water temp on my Bosch tank so high?

Check the wire connections on the water valve and control panel. The temperature detected by the outlet temperature sensor is over 185 F. Ensure that the sensor is working correctly, and the wire connections are not loose. Another reason for the high temperature is the sediment build-up, so descaling is needed.

Why does my Bosch water heater not make sparks?

The ionization electrodes are not making sparks when water is flowing. There are many reasons for this problem and here are some; low gas pressure, the fan speed is low, wire connections are loose, the air in the gas line, no gas. Ionization electrode failure during water heating.

Is there a warranty on a tankless water heater?

A tankless water heater provides an endless supply of hot water and reduces energy costs. The heating element is covered under warranty for a period of five years. All other parts are covered under a one-year warranty. If the tankless water heater develops a problem, troubleshoot it before calling for service.

How can I tell if my tankless water heater is having problems?

If after 10 minutes or so, there is still a flow of water you have a problem with the crossover. Most tankless water heaters are equipped with a diagnostic system that incorporate the microprocessor and LCD screen, which displays an error code if the problem occurs.

Is there an error code on my Bosch water heater?

Bosch is a well-known brand of tankless water heaters that are commonly used by many homeowners. If there is a fault with your Bosch tankless water heater, a certain error code will be displayed on the unit’s display. This error code gives owners a window into what is going on inside the unit.

What do I need to know about my Bosch water heater?

The primary fan spins slowly when the water heater is working. Check the wiring connection on the fan and control board. The voltage must be 120 VAC and the element correctly grounded. Does the venting system meet the code and manufacturer requirements?

Why does my Bosch hot water heater not heat up fast?

You get that problem with any tankless hot water heater, and it is worse if you turn off the water to conserve it, getting more cold water bursts as a result. Bosch hot water heaters do not heat the water up that fast unless you put it on the winter settings. That turns on three of the burners instead of one.

How to troubleshoot a Bosch tankless water heater?

Check the wire connections on the gas valve and control board. Measure the voltage on the wires when a water heater is ON… it should be 24 VDC. If the measurement is as specified, the gas valve is malfunctioning. And what do you think about Bosch? Click below to see contributions from other visitors to this page… Had a Bosch heater for 15 years.

What should the pressure be on a Bosch Mini Tank Heater?

Use the supplied pressure/temperature relief valve for the heater. If an alternate is used, ensure the valve is rated for a maximum pressure of 150 psi and a max water temperature of 210F. The temperature probe should not extend beyond 4 inches in order to maintain adequate distance from the heating element.

Why is my Bosch water heater flashing an error code?

This is not an error code; it is a flashing status message that tells you to check; the wiring connection, gas pressure as it might be too low, voltage as it doesn’t meet the required 120 VAC, the unit that might not be properly grounded or the issue with the control board. The primary fan spins slowly when the water heater is working.

The primary fan spins slowly when the water heater is working. Check the wiring connection on the fan and control board. The voltage must be 120 VAC and the element correctly grounded. Does the venting system meet the code and manufacturer requirements?

Can a tankless water heater be turned off?

The gas valve feeding your tankless unit is turned ON, not OFF. You’re scheduling regular maintenance. Getting regular maintenance will catch or prevent other tankless problems. Your plumber may also recommend you need a water softener to combat hard water.

Why does my tankless water heater get cold?

First off, this is a common tankless problem called a “cold water sandwich”. This problem happens because the heat exchanger (the part that actually heats the water) takes a while to warm up. Before it fully warms up and starts heating the water, you get a short run of cold water.

Why do I get No hot water from my hot water heater?

If you get no hot water when only one hot water appliance is running and you have a gas tankless unit, make sure that: You’ve paid your gas bill (your tankless water heater can’t heat water without a steady gas supply!) The gas valve feeding your tankless unit is turned ON, not OFF. You’re scheduling regular maintenance.

How does a Bosch tankless hot water heater work?

Bosch tankless water heaters work “on-demand” to produce hot water when needed, for as long as needed. There is no storage tank, so you never have to worry about running out of hot water or waiting for the tank to recover, even during peak use. A tank style hot water heater keeps water hot 24 hours a day, whether it is needed or not.

What should I do if my tankless water heater shut itself off?

So to avoid damage to the heat exchanger (and to avoid scalding you with super hot water), your tankless unit will shut itself off, leaving you with cold water in the middle of your shower. If this is a persistent problem ask a plumber if you should upgrade your unit. Most older water heaters have a minimum flow rate of 1/2 to 3/4 gpm.

Why is my hot water heater shutting itself off?

If the amount of hot water you’re asking for is below the minimum flow rate for your unit, your unit is probably shutting itself off as a safety precaution. You see, if not enough cold water is flowing over the heat exchanger, it runs the risk of overheating.

Why does my tankless water heater turn cold?

Icy cold water splashes your noggin and down your back. Then, just as suddenly, the water may turn hot again. What gives? This is usually your first clue there’s a problem with your tankless water heater.