71
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Noritz · Tankless Water Heaters
Gas solenoid valve drive circuit abnormality.
Quick Answer
Error code 71 on your Noritz Tankless Water Heaters means: Gas solenoid valve drive circuit abnormality.. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Power cycle unit and confirm code repeats.
2
Have technician inspect gas valve circuit and voltage.
3
Test coil resistance and connector condition.
4
Replace defective control components.
5
Run full combustion/safety validation after repair.
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
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