sentronic not holding open

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The "B" means "Bypass". The "80 or 140" is the degree of door opening from the fully closed position.  "B80" means the hold open feature is bypassed (will not hold open) until the door is opened...
If a door is being held open by the LCN SEM 7800/1900 magnet or any ME/SE Series Sentronic LCN closer, you can remotely release that door to close by ordering the following parts and wiring per ST ...
If an ME Series closer creeps shut or will not hold open, Verify proper voltage is being supplied to the closer, if correct Check the on/off switch. Verify the voltage on the 2 pin co...
If mechanism cover plate causes the EL solenoid to drop when slid over the solenoid, the solenoid plunger requires adjustment.  You must lengthen the rod by turning the hex nut in front of the plun...
 The correct method (process) for setting the hold open is: The 4010 hold open arms are handed, verify correct hand arm. (R or L stamped on main arm) Loosen the hold open nut. Opened the door ...
The ES Filter started to ship with these units (Senior Swing/Benchmark/Falcon) on 4/22/2013.  The ES Filter kit will help eliminate line noise from an Electric Strike if used. 
On the Senior Swing, if you have line noise from a strike the unit will go into an Error Code on the Control Box (Er14) and will not operate.  Adding the ES Filter, which is a diode, will eliminate...
On the Benchmark and Falcon, if there is line noise from a strike then the unit will lose it's hold open time.  Adding the ES Filter, which is a diode, will resolve this issue and the unit will hol...
A 4040SE would not hold the door open if it has : No Voltage or Improper Voltage. Check that the track has proper voltage going to it (24V AC/DC or 120V AC). If 120 volts is supplied...
The correct method (process) for setting the hold open is: The 4110 HEDA arms are handed, verify correct hand arm. (RH or LH stamped on shoe bracket) Loosen the hold open nut at shoe bracket. ...
Hold Open Closers & Magnets (Fire/Life safety products) provide a wide range of solutions.  Single or multi-point hold open closers Utilize an electromechanical closer. Hold the door o...
The 4040 regular and hold open arms are different. You would have to get a different arm to convert from regular arm to a hold open function. 4040-3077 for a regular arm. 4040-3077L for a long ...