Troubleshooting - Maytag ERV-150 Installer Manual

13.0 Troubleshooting

NOTE: Inspect the unit before proceeding with these steps.
Start-up troubleshooting:
Problems
1. Unit does not work.
2. The damper actuator • The 9-pin connector may
does not work.
3. The wall control does • TBI mode is activated.
not work OR
the indicators flashes
every 8 seconds.
Possible causes
• The circuit board may
be defective.
have a loose connection.
• The damper actuator may
be defective.
• The circuit board may
be defective.
• The wires may be in
reverse position.
• Erratic operation of the
control every 8 seconds.
• The wires may be broken.
• There may be a short-circuit. • With the help of a multimeter, check for continuity.
• The wire in the wall OR
the wall control may
be defective.
• The circuit board may
be defective.
You should try this
VE0082
• Unplug the unit. Disconnect the main control
and the optional(s) control(s) (if need be). Jump
B and G terminals. Plug the unit. If the motor
runs on high speed and the damper opens, the
circuit board is not defective.
• Unplug the unit and check to make sure all the
crimp connections are secured. Check the damper
actuator connections as well.
• Feed 120 V directly to the damper actuator. If the
problem persists, replace the damper actuator.
• Replace the circuit board if the problem is not
solved by the above.
• If the outside temperature is below -15°C (5°F)
and the unit has an enthalpic recovery core
(energy recovery core), then the TBI mode is
probably activated. (See Section 7.5.)
• Ensure that the color coded wires have been
connected to their appropriate places.
• Unplug the unit. Wait 30 seconds. Plug it back in.
• Inspect every wire and replace any that are damaged.
• Remove the wall control and test it right beside
the unit using another shorter wirer. If the wall
control works there, change the wire. If it does
not, change the wall control.
• If the second wall control does not solve the
problem, then replace the circuit board.
30
B
G