52
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Rinnai · Tankless Water Heaters
Modulating gas solenoid valve signal abnormal.
Quick Answer
Error code 52 on your Rinnai Tankless Water Heaters means: Modulating gas solenoid valve signal abnormal.. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Do not continue cycling the unit repeatedly.
2
Have technician inspect valve harness and connector pins.
3
Measure valve coil resistance.
4
Replace gas valve assembly if out of spec.
5
Run combustion setup check after repair.
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
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