Specifications

VCES-ERV-IOM-3B – Indoor ERV
30
Appendix G: Troubleshooting
Table G1: Troubleshooting – ERV100i, ERV1500i, ERV2000i, ERV3000i
Problem Cause Solution
Unit will not turn on. Occupied timer contacts open.
Check external wiring.
Check the wiring in the control box.
Check the control board for power.
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 heat exchanger for blockage. Check
balance of airflows. Install postheat module.
Unit makes an annoying noise.
Blower wheel out of alignment.
Remove the motor/blower assembly.
Adjust blower wheel.
Enthalpy wheel wiper seal not func-
tioning properly.
Check for proper seal operation.
Enthalpy wheel freezing.
Imbalance of supply and exhaust air.
Check filters and heat exchanger for blockage. Check
balance of airflows.
Defrost damper not functioning. Check for operation of damper actuator.
Preheater not functioning. Check the operation of the electric preheater controls.
Enthalpy wheel not running.
Enthalpy control contacts closed. Check jumper wiring for proper operation.
Electrical supply interrupted.
Check unit circuit breaker. Check two-wire service
connector on motor.
Drive motor capacitor.
Check capacitor connections. Check motor operation
with a 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 drive pulley or
failure.
Drive pulley. Check for securely fastened pulley on motor shaft.
Motor and blower not functioning.
Electrical supply interrupted.
Check unit circuit breaker. Check four-wire service
connector on each motor.
Fan motor capacitor.
Check capacitor connections. Check motor operation
with a new capacitor.
Fan motor failure. Check fan motor.
Fan motor contactor in control box. Check contactor wiring. Check contactor operation.
Fan drive belt. Check for failure. Check for proper tension.
Fan drive pulleys.
Check for securely fastened pulley(s) on motor or fan
shaft(s). Set screw setting at 100 in-lbs to 130 in-lbs.
Only supply fan will turn on. Unit is in recirc defrost (recirc units).
Wait until unit is out of defrost.
Defrost relay is not working.
Only exhaust fan will turn on.
Unit is in defrost (exhaust units).
Check connection to motor.
Motor wiring incorrect.
Damper will not open.
Electrical supply interrupted.
Check wiring on damper actuator.
Check three-wire service connector on control box.
Defrost relay in control box. Check relay wiring. Check relay operation.
Electronic control board. Test the defrost on control board.
Thermistor. Test the thermistor operation.
Damper opens when it should be
closed.
Wires are reversed. Reverse wires #2 and #3 on damper actuator.