After 30 years use, I replaced my water heater pump Grundfos model UP 15-18 with a new unit 3 years ago. I just noticed it no longer seems to be working: it just hums very quietly, no vibration whatsoever. The capacitor measures 10 uf as rated. I have 46 ohms resistance between the plug, zero to ground. Before I replace [fairly pricey], any other tests or ideas? Thank you.
- posted
13 years ago