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No Indicator Light |
DEDPV not operating when dryer runs
Check that the pressure tube is free of moisture, cracks, and properly inserted into the exhaust duct upstream of the fan.
Solution:
The DEDPV-705 is interlocked to the dryer by sensing the pressure inside the exhaust duct when the dryer turns on. Replace
the tubing if damage is observed
Verify that the low voltage wiring is properly plugged into the DEDPV-705.
Solution:
The Indicator LED is polarity sensitive. Check that the RED wire is connected to the positive terminal and the BLACK wire is
connected to the negative terminal.
The DEDPV-705 has a non-resettable thermal fuse link which will trigger when exhaust temperatures exceed 196°F. This is a
safety feature designed to prevent the DEDPV from operating during abnormal/dangerous drying conditions. Call Technical
Support for authorization before opening the electrical compartment; check resistance across the thermal overload protector.
Solution:
Dryers are equipped with operating temperature controls that monitor drying temperatures. Normal exhaust temperatures
should not exceed 167°F. If the safety thermal fuse in the DEDPV-705 trips, the dryer is operating outside its limits. Contact the dryer
manufacture and replace the DEDPV-705.
Single Flash |
DEDPV fan wheel is locked or rotation not detected
Remove DEDPV and check for lint or debris that may have accumulated at both the inlet and outlet side of DEDPV-705. A
double flash would most likely be a pre-curser to the symptom.
Solution:
Routine maintenance on all dryer exhaust systems are necessary to ensure lint is not accumulating and creating blockages.
A hall effect sensor integral to the motor is used to sense the rotation of the fan wheel. A loose connection within the fan
electrical box can cause the system to think there is no rotation.
Solution:
Call Technical Support for authorization to open the electrical box and check connection (H1, H2, H3).
Double Flash |
DEDPV abnormal operation; less than standard speed
If lint or debris is accumulating near the inlet of the motor wheel there may be a reduction in detected RPM. This could be an
indicator that maintenance is required.
Solution:
Loosen the 4 fast clamps and remove the extender tubes. Cleanout all debris and lint from both inlet and outlet side of the
fan.
Triple Flash |
Low Airflow (Restrictive)
Only available on models identified as 46005 & 46006.
As the pressure inside the exhaust duct increase, the fan speed inherently also increases. Building codes require a minimum air
velocity of 1200 ft/min; limits have been put in place to alert the occupant when the exhaust system is performing below this
requirement.
Solution:
On existing systems, if this is the first time such an indicator is observed, have the exhaust system inspected and cleaned
from dryer to the exterior termination. This is an indicator that a blockage is forming either upstream or downstream of the DEDPV-
705.
Solution:
On new construction, this may be an indicator that the overall exhaust duct layout is too restrictive. Review STEP 1 of the
installation manual to ensure duct length has been calculated properly.
If the flashing occurs ONLY during the DEDPV-705 final 5 minute cool down cycle, there is no safety concern
TROUBLESHOOTING
