Bell & Gossett Pump Fault Codes — Quick Reference
Bell & Gossett (B&G), a brand of Xylem, produces hydronic circulators for heating and cooling systems. Fault indicators vary by series: older Series 100 and Series 60 pumps have no electronics; the e-80, ecocirc, and NRF series use LED status indicators and, on some models, a digital display. The B&G ECM-powered pumps (e-80 Pro, ecocirc Pro) provide the most detailed fault information.
| LED / Display | Model Series | Meaning | Quick Fix |
|---|---|---|---|
| Solid red | e-80, ecocirc | Pump fault | Check for blockage; check voltage |
| Flashing red | e-80 Pro | Dry running detected | Prime system; check suction |
| E1 | ecocirc XL | Rotor blocked | Free impeller; remove debris |
| E2 | ecocirc XL | Motor overtemperature | Check system temp; reduce speed |
| E3 | ecocirc XL | Internal electronics fault | Power cycle; replace if persists |
| E4 | ecocirc XL | Supply voltage fault | Check incoming voltage |
| E5 | ecocirc XL | Dry running | Fill and prime system |
| No display | All ECM series | No power | Check breaker; check wiring |
| Green solid | e-80, ecocirc | Normal operation | None |
| Green flashing | e-80 Auto Adapt | Learning / adapting | Normal — do not interrupt |
Most Common Faults
E1 / Solid Red — Blocked Rotor
B&G wet-rotor circulators share the same susceptibility to rotor blockage as other wet-rotor brands. After extended shutdown or in systems with high mineral content, the impeller can seize. On e-80 and ecocirc models, the front motor module can be removed to access the impeller chamber. Use the manual rotation slot (a small slot on the motor shaft end) with a flathead screwdriver to manually break loose the impeller. After manually freeing it, reinstall and power cycle.
E5 / Flashing Red — Dry Running
The pump is running without liquid contact on the rotor shaft. The ceramic shaft bushing relies on liquid for lubrication — dry running quickly destroys it. Causes: air-locked system, closed isolation valve, system not properly filled. Open system air vents to bleed air, verify all valves are open, and confirm the system is fully pressurized (typically 12–15 PSI cold on a residential heating system).
E2 — Motor Overtemperature
Check the hydronic system water temperature — B&G ecocirc pumps are rated for systems up to 230°F (110°C). If the temperature is normal, check for flow restrictions. In systems with glycol (antifreeze), verify the glycol concentration is within the pump’s rated viscosity range — overly concentrated glycol increases viscosity and causes the motor to run hotter.
E4 — Voltage Fault
The pump supply voltage is outside acceptable limits. B&G e-80 Pro and ecocirc XL models accept 115VAC or 230VAC (check label). Measure voltage at the pump terminals under load. If voltage is low, check the branch circuit for undersized wiring or a failing circuit breaker.
Series 100 and Series 60 — No Electronics
The Bell & Gossett Series 100, Series 60, and Series 80 are PSC (permanent split capacitor) motors without electronics — they don’t produce fault codes. Common failures on these pumps:
- Pump doesn’t run: Check motor start/run capacitor; check 115VAC supply
- Pump hums but doesn’t start: Seized bearing or failed capacitor
- Pump leaks from shaft seal: Replace mechanical seal (pump must be isolated and drained)
- Noise during operation: Cavitation (low suction pressure) or worn bearing
B&G Pump Venting
All B&G circulator pumps with wet rotors should be bled after installation or system refill. The vent plug is on the front motor cap. Crack it open ¼ turn until water appears, then retighten. This removes trapped air from the motor cavity that can cause noise and prevent proper lubrication.
When to Call a Pro
Mechanical seal replacement on Series 100/60 pumps requires draining and isolation of the pump — a job for a licensed plumber in most commercial applications. E3 (internal electronics fault) on ecocirc XL typically requires pump replacement.