Suburban ST42A / ST60A (recirc models) error code E9
Recirculation failure — pump will not prime due to air in recirculation line
What to check, and in what order, is in the app. The flow Suburban tankless — IW60 / ST-42 / ST-60 error code + symptom diagnostic walks this code step by step with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.
Start free trial 14 days free, no card neededDocumented in
- Suburban ST42A/ST60A Service Manual - ERROR CODES chartAirxcel/Suburban
All Water Heater — Tankless error codes · Look up another code