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LED Error Codes Error Code Cause/Action Err1 Sensor fault; check sensor. Err2 ECOM fault; check EnviraCOM. wiring. Err3 Hardware fault; replace control. Err4 B1 fault; check B1 wiring/voltage. Err5 Low Line; Check L1-L2, 110 Vac. Err6 Fuse; Check ECOM wires, Replace fuse. Err7 EEPROM, HL, LL, Hdf, Ldf, Reset to default values. Err8 Repeated B1 fault (voltage present at B1 when output is turned off); check B1 wiring/voltage. 69-1957.1 2 L7224 SERIES L7224 SERIES Action System Response Thermostat calls for heat. Circulator starts when water temperature is above Low Limit setting (if applicable). Boiler temperature is checked. Burner starts when water temperature is below High Limit setting. Boiler exceeds the High Limit. Burner is turned off. Burner restarts when the water temperature drops below the High Limit setting minus the differential. Thermostat is satisfied. Circulator and burner turn off. Error conditions 1-5. If an error condition is detected, all outputs except ZC are shut down. Burner is off. Control continues to function and restarts when error is corrected. During the error check sequence, the system checks for drift in the sensor andcorrosion in the connections. Error conditions 6-7. If error condition 6 or 7 occurs, the control has reset the High Limit, Low Limit and Differential Setting to a default setting and will continue to run at those settings. Performance of the system will be degraded. Error condition 8. If the error condition is detected, all outputs except ZC are shut down. Burner is off. Control continues to function and restarts when all three user keys have been pressed longer than 60 seconds. Troubleshooting When attempting to diagnose system performance, reference the LED display to help identify specific areas not working properly. The LED display will scroll .err., followed by a digit (1-8). See Table 1 for a description of the error and suggested actions. See below for a troubleshooting guide. Table 3. Troubleshooting Guidea. SystemCondition DiagnosticCondition Check Action Boiler is cold, house is cold Display is OFF 120 Vac system power. Turn system power on. Display is ON; TT-LED is OFF 24 Vac T-T No 24V; replacecontrol Display is ON; TT-LED is OFF 24V present; disconnect thermostat, short T-T Boiler starts, check wiring and thermostat a. Refer to Fig. 5 for Display and LED locations. b. ZC LED ON indicates ZC terminal power is OFF. c. ZC LED OFF indicates ZC terminal power is ON. 3 69-1957.1 Table 3. Troubleshooting GuideTable 3. Troubleshooting Guide. SystemCondition DiagnosticCondition Check Action Boiler is cold, house is cold Display is ON; TT-LED is ON B1 LED is ON 120 Vac at B1B2 . If no, replace control. . If yes, check burnerand wiring Display is ON; TT-LED is ON Refer to err on display . Boiler is hot, house is cold Display is ON; TT-LED is ON C1 LED is ON 120 Vac at C1C2 . 120 Vac at C1-C2, check wiring to pump . Wiring ok, is pump running? If not, replace the pump. . If pump is running, check for t...
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