Check that the water pressure of the unit is above 30 psi if it s not you can do the following test to check the flow rate.
Bosch propane tankless water heater troubleshooting.
Put the other end of the garden hose near the floor drain or in a larger basket.
Inspect the water supply.
Warranty labor request form.
Shut off the cold water supply and disconnect the hot water supply.
This is the place for troubleshooting problems with your gas tankless water heater.
Inspect the plumbing for restrictions.
In the event of any temperature instability with the use of a temperature balance shower valve refer to shower valve manufacturer s instructions for internal adjustment setting.
Flush the water heater you can connect the garden hose to the tankless water heater drain outlet near the base.
Error code a2 problem with the flue gas limiter.
When the error code appears on the bosch heater s lcd display the reset button sometimes leads to an error removal but if it doesn t work the instructions below might help troubleshoot the problem.
Open the cold water supply and put a container underneath to check the water.
Pipe joints should not be sealed with plumber s glue.
Connect the supply line to the blue inlet on the water heater.
Problems with water flow.
Bosch online technical support form.
This can slow the flow within the tankless water heater decreasing it below activation point which shuts off the burners.
Easily identify and troubleshoot your issues with our parts diagrams pdfs.