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Troubleshooting
The following is a cause and correction list for common concerns with the damper:
Problem
Damper does not move
Damper attempts to move
but, does not open fully
High noise level
Leakage detected across
damper
Leakage detected through
damper frame
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As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Product warranties can be found online at Greenheck.com, either on the specific product page or in the literature
section of the website at Greenheck.com/Resources/Library/Literature.
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Phone: 715.359.6171 • Fax: 715.355.2399 • Parts : 800.355.5354 • E-mail: gfcinfo@greenheck.com • Website: www.greenheck.com
4
482752 • HBT Series, Rev. 4, September 2022
Possible Cause
No power to actuator
Actuator failed
Actuator attempting to rotate in wrong
direction
Linkage/coupling failed
No modulating signal
Obstruction in damper linkage or
inside duct
Actuator sizing incorrect
(excessive torque required)
Obstruction in damper linkage or
inside duct
Modulating control not going full span
Actuator travel stops incorrectly
adjusted
Damper with jamb seals installed with
blades vertical
Very high velocity/flow
Damper not closing fully
Damper not closing fully
Blade edge seals failed
Double gland packing not tight
Double gland packing worn
Solution
Verify presence of correct power to actuator.
Power actuator independently of damper.
Check wiring. Run actuator independent of damper if necessary.
Inspect coupling, keys, and connecting linkage for failed or broken
components. Replace as required.
Verify presence of modulating signal.
Verify signal is compatible with actuator.
Verify if signal is driving actuator in the correct direction.
Inspect for projecting mounting bolts, debris inside damper and
remove.
Verify that correct operating pressures, velocities, and temperatures
were given to manufacturer for actuator sizing. Replace actuator if
necessary.
Inspect for projecting mounting bolts, debris inside damper and
remove.
Verify control signal span from controller.
Some actuators are equipped with mechanical stops to limit rotation.
Adjust as necessary.
Consult factory, for modifications if vertical blade orientation not
specified on damper with seals.
Reduce flow through damper.
Readjust actuator or drive linkage to fully close damper.
Re-adjust actuator or drive linkage to fully close damper.
Replace blade edge seals.
Tighten adjustment nuts on double gland stuffing box
Replace packing as required.
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