Blinking light on range hood

It sounds like the control board has failed in regards to the lighting section or does it have a separate switch? The parts list has something listed as 'interface' . It is a $197 guess though for the control board! Did you remove the 4 halogen bulbs and test them with a multimeter? You should be able to test the switch.

https://www.partswarehouse.com/Broan-QP236SS-Range-Hood-s/402673.htm

https://www.google.com/search?q=broan+qp236ss+hood+lights+not+working

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here is the manual.
If it is an LED bulb it may be bad. LED's tend to blink constantly when bad.
https://manualsbrain.com/en/manuals/908701/

The fan light switch blinks when it is time to clean the filter. Clean the filter, then press and hold the switch for 3 seconds to reset it.

I believe that's the "change or clean filter" indication. Clean the aluminum filters in the dishwasher, replace the charcoal filters if non-ducted, press the fan light over 3 seconds and it should reset.

follow this steps with VOM and fix it. God bless you
1. No power to the range hood
Make sure there's power getting to the range hood. Check for a tripped circuit breaker or a blown fuse. Check the wall socket (unless the hood is hard wired) for power with a voltmeter or by plugging something else in.

2. Fan switch
If your range hood only has a fan and no light or any other features, it won't start with a broken fan switch. Replace the switch if found defective.

3. Fan motor
If your range hood only has a fan and no light or any other features, it won't start with a broken fan motor. Replace the motor if found defective.
Read more: http://www.appliancepartspros.com/repair-help/rangehood-repair-help.html#ixzz2aSy5FKwN
http://www.appliancepartspros.com

test this steps and fix it. God bless you

1. No power to the range hood
Make sure there's power getting to the range hood. Check for a tripped circuit breaker or a blown fuse. Check the wall socket (unless the hood is hard wired) for power with a voltmeter or by plugging something else in.

2. Fan switch
If your range hood only has a fan and no light or any other features, it won't start with a broken fan switch. Replace the switch if found defective.

3. Fan motor
If your range hood only has a fan and no light or any other features, it won't start with a broken fan motor. Replace the motor if found defective.

see this steps and fix it. God bless you
Switch If the range vent hood fan and light are not working the switch might be defective. Watch our video on switch testing and test this switch for continuity.

Selector Switch If the range vent hood fan and light are not working the selector switch might be defective. Watch our video on switch testing and test this switch for continuity.

Rotary Switch If the range vent hood fan and light are not working the rotary switch might be defective. Watch our video on switch testing and test this switch for continuity.

Rocker Switch If the range vent hood fan and light are not working the rocker switch might be defective. Watch our video on switch testing and test this switch for continuity.

Switch Kit If the range vent hood fan and light are not working the switch kit might be defective. Watch our video on switch testing and test this switch for continuity.

Micro Switch If the range vent hood fan and light are not working the micro switch might not have continuity. The best way to test the switch is with an Ohm meter. See our switch testing videos for help testing this micro switch.

Thermal Fuse If the range vent hood fan and light are not working the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

Main Control Board If the range vent hood fan and light are not working the main control board may be defective.

User Control and Display Board If the range vent hood fan and light are not working the user control and display board may be defective. Check other causes before ordering this board.

I turned both the light and fan on then pushed the filter button. After a loud beep the filter light reset went off. This worked for me.

We installed our Broan-Allure range hood about ten years ago. On three seperate occasions since, the fan has randomly turned on and none of the control buttons would turn it off. After a while it turns itself off. During those same times, when you turned the lights on, they would blink before finally staying on. On each occasion, I have removed the screens and metal underpieces to gain access to the circut board. Once you can see the circut board, remove and replace the 3 Amp fuse that is mounted on the board. (Radio Shack part # 270-1054)...even if the fuse looks good, replace it. Each time this has work for about three years, then it acts up again..