part nos 45720 and 45725 - Venmar

13. Troubleshooting (cont’d)Problems Possible causes You should try this6. Unit doesn't work. • The circuit board maybe defective.• Unplug the unit. Disconnect the main controland the optional control(s) (if need be).Jump B and G (BLACK and GREEN)terminals. Plug the unit. If the motor runson high speed and the damper opens,the circuit board is not defective.BG7. The wall control doesnot work.8. The Dehumidistat doesnot work OR the20/40/60-min.push-button timer doesnot work or is indicatorlight does not stay on.9. The defrost cyclet doesnot work (the fresh airduct is frozen OR thefresh air distributed isvery cold).• The power cord fusemay be blown.• The wires may be inreverse position.• The wires may be broken.• There may be a short-circuit.• The wire in the wallOR the wall controlmay be defective.• The circuit board maybe defective.• The dehumidistat ORpush-button may bedefective,• Ice deposit may behindering the damperoperation.• The damper rod or theport damper itself maybe broken.• The damper actuatormay be defective.• The circuit board maybe defective.• The thermistor may bedefective.• Unplug the unit. Unscrew the fuse holder(grey circle on illustration beside).Check if the fuse is blown (the strand isbroken). If it is blown, replace the fuseaccording to the specifications on theunit power cord tag.• Ensure that the color coded wires have been connectedto their appropriate places.• Inspect every wire and replace any that are damaged.• With the help of a multimeter, check for continuity.• Jump B and G (BLACK and GREEN) terminals. If unitswitches to high speed, remove the wall control and testit right beside the unit using another shorter wire. If thewall control works there, change the wire. If it doesn’t,change the wall control.• If the unit does not switch to high speed, replace thecircuit board.• Jump the OL and OC terminals. If unitswitches to high speed, remove theDehumidistat or push-button and test itright beside the unit using anothershorter wire. If it works there, changethe wire. If it doesn’t, change theDehumidistat or push-button.• Remove the ice.• Inspect these parts and replace if necessary.• Plug in the unit and select “MIN” or “MAX”. Press the doorswitch and see if the port damper opens. If it doesn’topen, feed 120V directly to the damper actuator. If theport damper still doesn’t open, replace the damper actuator.• Unplug the unit. Unplug the defrost sensor wire (see J4on electrical diagram Section 9). Plug the unit back in.Select “MIN” and make sure the unit is adjusted for lowspeed operation (turn all Humidity Controls maximumcounterclockwise).Wait 3 minutes. The unit should switchto high speed and the damper at the fresh air intakeport should close (defrost mode). If this doesn’t happen,then replace the circuit board.• If the defrost mode works well after having disconnectedthe thermistor wire (above test), this means the thermistoris probably defective. You should replace it.VE0082VE0194VE0067OLOC