Fig. 18.
YES
NO
1
IS THE BOILER LED LIT ON THE ERM5220R
BOILER DOES NOT RUN WITH A CALL FOR HEAT FROM THERMOSTAT
IS THE LED ABOVE THE O/B/T TERMINAL LIT GREEN
ON THE ERM5220R? (NOTE, THE LED OVER Y2/T
WILL NOT BE LIT WITH A CALL FOR BOILER HEAT)
YES
NO
YES
NO
IS THE COMPRESSOR LED LIT ON THE ERM5220R?
REMOVE THE R TO J JUMPER ON ERM
FOR BOILER APPLICATIONS. SEE
WIRING DIAGRAMS (FIGURES 12-15).
VERIFY CONNECTIONS TO R AND C AND
VERIFY 24 VAC TO THOSE TERMINALS.
SEE WIRING DIAGRAMS (FIGURES 12-15).
24 VOLTS
0 VOLTS
T-T IS A DRY CONTACT SWITCH. 0 VOLTS
INDICATES THE SWITCH IS CLOSED.
ISSUE IS WITH WIRING OR BOILER
ERM IS NOT LINKED TO THE
THERMOSTAT. SEE PAGES 14-17
FOR ASSISTANCE LINKING.
ERM LOST COMMUNICATION TO THERMOSTAT. CHECK THERMOSTAT DISPLAY.
IF POWER HAD BEEN LOST, WAIT AT LEAST 6 MINUTES AFTER POWER IS
RESTORED FOR LINK TO REESTABLISH. IF LED ON ERM REMAINS RED, PRESS/
HOLD BUTTON ON ERM FOR OVER 10 SECONDS. LED SHOULD GO OUT, COME
ON RED, THEN GO OUT AGAIN. THEN SEE PAGE 16 FOR ASSISTANCE RE-LINKING.
VERIFY THE THERMOSTAT SHOWS “HEAT ON” IN
DISPLAY. IF THERE IS MORE THAN ONE
THERMOSTAT IN THE HOME, IT IS POSSIBLE THAT A
DIFFERENT THERMOSTAT IS PAIRED WITH THIS ERM.
WHAT DOES THE CONNECT LED
ON ERM5220R INDICATE?
UNLIT
SOLID RED
SOLID GREEN
YOU CANNOT TEST THESE TERMINALS WITH A CONTINUITY METER. WHEN WIRES ARE NOT CONNECTED TO THESE TERMINALS,
THERE WILL BE INFINITE RESISTANCE ACROSS THE TERMINALS WHETHER THE DRY CONTACT SWITCH IN THE ERM IS OPEN OR
CLOSED. ONLY TEST WITH THE WIRES CONNECTED.
IF THE ISSUE IS NOT RESOLVED, PLEASE CALL THE SUPPORT LINE FROM THE SITE FOR FURTHER TROUBLESHOOTING AT
800-468-1502 BETWEEN 8-4:30 CST M-F.
24 VOLTS INDICATES THE SWITCH IS OPEN. WHEN THE BOILER LED AND O/B-T LEDS ARE
BOTH SOLID GREEN WE WOULD EXPECT THIS SWITCH TO BE CLOSED. REPLACE ERM.
IF YOU HAVE MORE THAN ONE FAILURE OF THIS TYPE, PLEASE CALL THE SUPPORT LINE
FROM THE SITE FOR FURTHER TROUBLESHOOTING AT 800-468-1502 BETWEEN 8-4:30 CST M-F.
M36130
1
ERM IS INDICATING A CALL FOR HEAT.
MEASURE VOLTAGE ACROSS THE T
AND T TERMINALS ON ERM.
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