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This feature is not there on older board versions with 3 pin jumpers. Override Test To use override test function, a thermistor must be connected to the control board. Unit must not be in defrost mode during an override test. High Speed 1. Disconnect ERV/HRV from 115VAC. 1. Unplug wall control wires at control module terminal block inside ERV/HRV. 2. Plug ERV/HRV back to 115VAC. 3. Attach a wire across J3- --8 and J3- --9 (B and G) on control module terminal block. 4. Close door, this will initiate a high- --speed exchange. Low Speed 1. Unplug ERV/HRV from 115VAC. 2. Disconnect wall control wires at control module terminal block inside ERV/HRV. 3. Plug ERV/HRV back to 115VAC. 4. Connect a 3.0 K ohm resistor between B and G on control module terminal block. 5. Close door, this will initiate a low- --speed exchange. Blower Speed Selection Three- --speed blowers are factory connected to electronic control board on HIGH- --and LOW- --speed taps of blowers. Installer can easily change low- --speed tap to medium- --speed tap so electronic control will select between high and medium speed. Connections can be changed at transformer location. See Connection diagram, Fig. 17. ERV/ HRV 9 If the integrated control LED of the unit is flashing, this means the unit sensors detected a problem. See the table below to know where on the unit the problem occurs. Table 5 – Troubleshooting ERV/ HRV LED flashes GREEN. Thermistor error. Reference Table 6 for proper temperature vs. resistance relationship. If thermistor is defective, replace the entire port assembly (fresh air from outside port). LED flashes RED. The door is open and the unit is not Close the door and press once on the integrated control push button to reset the unplugged. unit. Exhaust motor error. Go to Problem 5 below. LED flashes AMBER. Damper error. Go to Problem 6 below. Problem: Possible causes: You should try this: S The circuit board may be defective. S Unplug the unit. Disconnect the main control and the optional control(s) (if need be). Jump G and B terminals. Plug the unit back and wait about 10 seconds. If the motors runonhighspeed andthe damper opens, the circuit board is not defective. NO C NC I OC OL Y R G B 1. Unit does not work. 3. The wall control does not work OR its indi- cator flashes. 4. The dehumidistat does not work OR the 20--minute. push-- button timer does not work OR its indicator light does not stay on. 5. The supply and/or exhaust motor do not work. 6. The defrost cycle does not work (the fresh air duct is fro- zen OR the fresh air distributed is very cold. (See Table 7 for Defrost Cycle Tim- ing.) 2. The damper actuator S The damper actuator or the integrated S Unplug the unit. Disconnect the main control and the optional controls(s) (if need does not work. damper port mechanism may be be).Wait 10 seconds and plug the unit back. Check if the damper opens. If not, defective. use a multimeter and check for 24VAC on J12- --1 and J12- --2 (in electrical compartment). If there is 24VAC, replace the entire port assembly. NOTE: It is normal to experience a small delay (7- --8 seconds) before detecting the 24VAC signal at starting- --up. This signal will stay during 17- --18 seconds before disappearing. S The circuit board may be defective. S If there is no 24VAC, replace the circuit board. S The wires may be in reverse position. S Ensure that the color coded wires have been connected to their work OR its indicator flashes. appropriate places. S The wires may be broken. S Inspect every wire and replace any that are damaged. S The wire in the wall OR the wall. S Remove the wall control and test it right beside the unit using another control may be defective. shorter wire. If the wall control works there, change the wire. If it does not, change the wall control. S The wires may be in reverse position. S Ensure that the color coded wires have been connected to their appropriate places. S The dehumidified or push button may be S Jump the OL and OC terminals. If the unit defective. switch to high speed, remove the dehumidistat or push button and test it right beside the unit using another shorter wire. If it works here, change the wire. If it doesn’t, change the dehumidistat or the push button. NO C NC I OC OL Y R G B S The circuit board may be defective. S Press on the integrated control push button until the unit turn on low speed (the LED will light AMBER). Using a multimeter, check the voltage on J4- --1 and J4- --2 (for supply motor), and on J5- --1 and J5- --2 (for exhaust motor). The reading must be ± 68VAC. Then set the unit on high speed by pressing on the integrated control 1 more time (the LED will light GREEN).Using a multimeter, check the voltage on J4- --1 and J4- --2 (for supply motor), and on J5- --1 and J5- --2 (for exhaust motor). The reading must be ± 120VAC. If all the readings correspond to the right voltage values, the circuit board is not defective. If one or both readings are different, change the circuit board. S The moto...

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