10
Moderate
Rinnai · Tankless Water Heaters
Air supply or exhaust blockage detected.
Quick Answer
Error code 10 on your Rinnai Tankless Water Heaters means: Air supply or exhaust blockage detected.. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Inspect intake and exhaust terminations for debris.
2
Verify venting material/layout matches Rinnai requirements.
3
Restart unit after clearing obstruction.
4
Check fan operation during startup.
5
Call licensed contractor if code returns.
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
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