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Marc, Plumber
Category: Plumbing
Satisfied Customers: 1127
Experience:  Plumbing heating & home maintenance contractor
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Bosch aquastar 240fx tankless water heater fires up 3 times

Customer Question

Bosch aquastar 240fx tankless water heater fires up 3 times after turning on hot water, then shuts off and flashes led.
JA: How long has this been going on? And how severe is the problem?
Customer: just started after being away for 3 days
JA: Do you plan on doing the work yourself?
Customer: yes
JA: Anything else we should know to help you best?
Customer: I removed the cover for the flame sensors and cleaned them with no change. the exhaust is clear and I blew out the burner area to make sure it was clean. The flame is a nice clean blue through the window when it ignites. The intake screen for the water is clean.
Submitted: 2 months ago.
Category: Plumbing
Expert:  Rick replied 2 months ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

Could be a faulty flow sensor. Here's the service bulletin to test and/or replace it