Voltage protection with 555 timer not working

Question

Briefing

I am using Multisim to simulate a circuit before building it.

The voltage protection circuit with a regulator works fine and the timer circuit works fine as well separately. When I try using the output of the protection circuit as input for the timer Multisim gives me an error.

Circuit Functionality

When an input is supplied to the voltage protection circuit only if the input is equal or greater than 47V should it activate and supply the regulated 14.5V coming from U4, next this input is used as a trigger for the timer as long as this voltage protection output is high the timers LED is active, should the voltage protection circuit go low the timer waits a few seconds and then the output goes low.

Please note, everything as I said works, the voltage protection alone and the timer works as intended but when I try to combine the two circuits is where it fails.

This is the voltage protection circuit:

This is the timer circuit:

This is the full circuit when I try to combine

This is Multisim error

Answer 1

Input voltage (47 V) in LM675 should not be greater than supply voltage (14.5 V).

Answer 2

The 555 Trigger input is dead-shorted to GND.

Update 1: With the short removed, the Trigger input cannot be pulled low by the 675 output because the diodes are pointed the wrong way. The trigger input must go below 4.8 V (Vcc / 3), but D3 prevents any current through R3 and R6.