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Rick, Construction Supervisor
Category: Plumbing
Satisfied Customers: 21386
Experience:  Licensed Master plumber with 40+ yrs. experience.
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I have a code 29 on my Richmond tankless water heater

Customer Question

I have a code 29 on my Richmond tankless water heater
Submitted: 1 year ago.
Category: Plumbing
Expert:  Rick replied 1 year ago.

When was the last time this unit was serviced? This error usually indicated a dirty heat exchanger. Could also indicate clogged condensate drain if this is a condensing unit

Customer: replied 1 year ago.
its never been serviced its only 8 months old
Expert:  Rick replied 1 year ago.

Try powering it down wait a minute then power it back up. If that doesn't clear the error then you'll have to can for service. It could also be a faulty sensor in the heat exchanger which should be covered under the warranty

Customer: replied 1 year ago.
I powered it down and it cleared the code but 5 minutes later it comes back
Expert:  Rick replied 1 year ago.

I'd suspect a bad sensor with a unit this new. There is one other possibility. Depending on the model if the air intake screen is blocked you could get this error. Make sure there's nothing obstructing the air flow around the unit. Beyond that you're going to need to call in a pro who can verify a warranty issue.

Customer: replied 1 year ago.
ok, thanks
Expert:  Rick replied 1 year ago.

You're welcome