Specifications

VCES-ERV-IOM-1A – ERV500i/e
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Table H1: ERV500i/e Troubleshooting
Problem Cause Solution
Unit will not turn on.
External wiring not connected. Check external wiring.
Internal wiring not making contact. Check the wiring in the control box.
Occupied/unoccupied control circuit is open. Close circuit.
Unit will not turn off. External terminal strip wiring.
Check if high or low speed control contacts are
closed on the terminal strip.
Air from supply diffusers
too cold.
Imbalance of supply and exhaust air.
Check filters and enthalpy wheel for blockage.
Check balance of airflow. Install post heat module.
Unit makes an annoying
noise.
Blower wheel out of alignment.
Remove the motor/blower assembly.
Adjust blower wheel.
Enthalpy wheel brush seal not functioning properly. Check for proper seal operation.
Enthalpy wheel not
running.
Electrical supply interrupted.
Check unit circuit breaker. Check two-wire service
connector on motor.
Drive motor capacitor.
Check capacitor connections. Check motor opera-
tion with new capacitor.
Drive motor failure. Check the drive motor.
Drive motor relay in control box. Check relay wiring. Check relay operation.
Drive belt.
Check for drive belt derailment off of drive pulley or
failure.
Drive pulley. Check for securely fastened pulley on motor shaft.
Free cooling contact closed. Open contact on external terminal block of unit.
Motor and blower not
functioning.
Electrical supply interrupted.
Check unit circuit breaker. Check three-wire service
connector on each motor.
Fan motor capacitor.
Check capacitor connections. Check motor opera-
tion with a new capacitor.
Fan motor failure. Check fan motor.
Fan motor relay in control box. Check relay wiring. Check relay operation.
Appendix H: Troubleshooting