Question about Dacor PRV36SS Stainless Steel Kitchen Hood

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My down draft vent (model PRV36B) cycles up and down continuously. The blower does not stop. How do I know if it is the limit switches or the electronics?

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I have a goodman model#gpd075, it will ignite, flames come on, then go out for a bit, furnace runs, then the flames ignite again! Why are the flames reigniting? Have cleaned and even changed that rod...


The two most likely possibilities would be either the high limit or the pressure switch.

1. The High Limit: Located on heat exchanger outside panel, usually right above the gas valve. It will have two wires going to it. If the high limit trips, it will cause the flames to go out but the blower will continue to run. This is to cool the heat exchanger compartment back down to a decent temp, also for safety reasons. You can check continuity between the two terminals to see if the limit has opened. If this is happening, you could have a faulty or weak limit, but it is usually caused by another problem. Make sure all filters are clean and there is no restrictions in the air flow. The less airflow across the heat exchanger, the more likely it will overheat. Other possibilities could be a dirty blower wheel or dirty/clogged evaporator coil restricting the airflow. Another thing to check is the gas pressure going to the burners, if it is higher than the recommended amount, it could "over-fire" the heat exchanger as well.

2. Pressure switch: Located close to the inducer draft motor. It will have a small tube running to it from the inducer motor assembly. These have been known to go bad, but like the high limit, it's usually something else causing the problem with the switch. When the small motor (inducer draft motor) comes on, it causes a negative pressure in the assembly, pulling the pressure switch in and making contact. This lets the furnace know that everything is venting properly. The most common problem causing the switch to be stuck open is the small tube being clogged with debris or condensation, blocking the air flow. Remove the tube from the pressure switch, blow thru tube, if there is a restriction, remove tube from inducer motor and unclog the nipple that the hose connects to. Usually a small wire or paper clip is good to use. Also make sure the pressure switch is operating by sucking and blowing through the tube as it is hooked to the pressure switch. You should hear the switch opening and closing. Again, being able to check for continuity is best.

These are two common problems for the issue you are having. I hope this helps in some way and gets everything back to normal. Have a good day and a good holiday as well!

Dec 01, 2013 | Heating & Cooling

2 Answers

I have a Kenmore series 90 dryer about 15 years old which stopped heating last week. I found several videos on you tube which detailed the steps to troubleshoot and repair. The steps were to check...


Blown high limit fusees can be caused by.
  1. Not enough airflow caused by blockage in the exhaust vent pipe.(most common) Check for strong airflow coming out of the back of machine, then check for good airflow at exterior vent. Clean vent if airflow is restricted.
  2. Bad drum seal
  3. Dirty lint screen
  4. Broken blower wheel
  5. Blockage inside the machine.

Jul 19, 2011 | Kenmore Dryers

1 Answer

I have a Ducane MPGA100B4B gas furnace. The furnace only runs for about a minute then shut off. It does this far too frequent.\r\n First the induce draft blower turned on for a few seconds to check for...


Hello, sounds like the limit switch is opening on the furnace.Usually when a furnace goes off on its high limit is becuase the airflow is being restricted making the furnace overheat. a limit switch is there to protect the furnaace from overheating, most cuases are either dirt or the blower motor not running up to speed, anything that cuts down on the airflow will cause the high limt switch to open.

Feb 24, 2011 | Heating & Cooling

1 Answer

Amana Dryer 's vent was restricted and stopped running. Now it is running but not heating and the heat elememt is testing good.What else can I check.


There is likely a high limit switch at the front near the blower. Unplug the unit and check continuity across it. Or start a cycle with it powered and check for voltage across the switch. If you read voltage, the limit is popped.

Jan 20, 2011 | Amana NDE2330AY Electric Dryer

2 Answers

Hi-limit thermostat keeps shorting out


Likely is. Low resistance means higher amperage (more current) so getting to upper limit too soon.

May 03, 2017 | Kenmore 63012 Electric Dryer

1 Answer

Furnace blower won't stop running


Usually when the furnace blower motor runs all the time
The limit switch or rollout switch is usually open or bad.
The furnace board is seeing that one of those switches is open, so it brings the blower on to try to get the heat out of the combustion chamber area, so the switch will close. But if the switch is bad and won’t close, the furnace board will keep the blower running continuously.

Jan 04, 2010 | Amana Comfort Zone 12M32PBEH Air...

4 Answers

Coleman model 296OC666 vent blower will not cycle off. Don't know what to check. Replaced the heating relay 2 yrs ago. Don't know if it controls the vent fan and being only 2 yrs old and all other systems...


Hi, being that this is a newer unit, you will need to look at the fan control, or high limit switch.They will stick on at times and the indoor fan will continue to run. Being a Coleman furnace, in behind the circuit board, you should have a fan switch that has a manual reset on it. Try to locate this and push the button to reset, and fan will cycle down.You may have to do some searching to find it, and you can also look at the schematic to point you to it.Please keep me informed and I will work on helping you solve this. Let me know. Sincerely,
Shastalaker7

Dec 11, 2009 | Coleman Heating & Cooling

2 Answers

Blower turns on when stat calls for heat but manifold is not being ignited (do not hear gas valve even trying to release gas). No spark either. Could it be insufficent gas pressure?


Here is the ignition sequence for a spark ignited furnace. This will help you understand what is happening/not happening.

Thermostat calls for heat.

draft inducer motor (DIM) starts drawing draft through heat exchanger.

Pressure switch detects proper operation of DIM, and sends signal to board to begin ignition.
(it detects negative pressure)

Ignitor starts ignition attempt and gas valve sends gas to burners.

Upon ignition, flame sensor detects flame and sends signal to board stopping ignition sequence and continuing gas flow for heat mode operation until thermostat is satisfied.

During this sequence the blower motor is brought on, and by using a series of temperature limit switches, the system assures that the unit is operating properly.
(If the blower is not operating, or the airflow is inadequate, the heat exchanger will overheat and trip one or more temp limit switches.)

There is also a "rollout" switch that detects improper flame pattern "rolling out" into the controls compartment.

Now, to apply that to your situation.

If you have no spark, than the failure is happening before the gas is supposed to be flowing.

That usually means a failure at the D.I.M. Typical causes for that are a clogged flue pipe/vent, damaged/deteriorated fan blades, bad fan, or bad pressure switch.

If one of the temp limit switches or rollout switches have tripped, it will simply shut off the system.
(Some units will turn on the blower motor and shut down everything else.)

You can try resetting the unit by disconnecting power for 1 minute, and attempting a restart.

First look for any flashing LED lights. If you see any locate the wiring schematic (usually on the inside of the front panel) and look for the flash codes.

If the reset does not solve the problem, let me know what flash code you are getting, and/or let me know exactly what you see the furnace doing, in detail, after the restart.

Oct 03, 2009 | Weather King 12AJA4801AH Air Conditioner

1 Answer

Goodman Model GMNT100-4 Auto Power Down and Up until Temp.


Keep in mind all furnaces and circuit boards are not the same. Look on the back of the door to the blower compartment. You should find the list of diagnostic codes. Look up four blinks it should narrow down the problem. Although from the discription you gave it sounds lie the high limit control. When a high limit appears to be acting up it DOES NOT mean that the high limit needs replaced. The high limit just may be doing its job. This means that the furnace is overheating. Check your filters. Are all of your registers open? Is your blower set on the right speed? Is your blower going bad? Is the blower motor capacitor bad? Is your evaporator coil restricted? Just changing a high limit switch does not always solve the original problem!
Good luck....

Apr 01, 2009 | Goodman Heating & Cooling

1 Answer

Goodman Furnace Intermittent


Does this piece, have an economizer and or vent draft options installed? I hope not. If not, I had the same sort of problem with a Payne unit, sort of the same style. First things first. bypass the thermostat by making a jumper or connecting the red to the white wire on the thermostat, see if that stops the problem. Repair techs are all to anxious to replace the board anymore. If the repair man installed a relay to bypass the blower control he is in over his head, the limit switch determines when the fan shuts on & off based on temperature. There is a relay on the control board that basically carries the load for the motor. Dont have anything else installed that need not be there (there is enopugh crap already from the factory) If you want to really fix this I need to know if you have and can read a volt/ohm meter and can understand a wiring diagram, hopefully yours is still there. let me know after the thermostat thing and I can walk you through this.

Dec 25, 2007 | Goodman GMS90703BXA Heater

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