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Janitrol gup power vent ignition sequence

When should janitrol gup power vent turn on.It has standing pilot.

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Inducer motor should run for several seconds before furnace lights, this proves the pressure switch and ensures proper ventilation

Posted on Sep 30, 2009


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My Janitrol/goodman model gups100-4 will not light pilot strong new thermocouple

Hello Hal,

The picture show with your question seems to indicate a small furnace... The THERMOCOUPLE statement flies in the face of that...

There's no extra charge for a more detailed question... but the only reason to replace a thermocouple is if the pilot lights... but wont STAY LIT...

The "pilot" click... would be really nice to hear about.

Most of your modern "sparkers" or HOT-SURFACE igniters
will only try a few times to light the pilot... then they should lock up... to keep from accumulating a dangerous amount of gas... and to avoid a possible EXPLOSION.

SOMETHING YOU MUST keep in mind while you are working on your heater... GAS.

To reset your logic... you might be able to simply remove power.

(in my opinion) The most common failure is a fractured hot surface igniter... (but I've put a page full of ideas below)

If you are hearing an initial click... check for line voltage at the hot surface... if equipped for the pilot to light... (this is where I put my finger to see if it was warm... That was how I DISCOVERED it was FULL LINE VOLTAGE (not a recommended... test).

If you are not getting that INITIAL CLICK you have several areas to pursue... low voltage transformer is good (volt-meter)...
High temp sensors (etc.)...

Not expensive... but dangerous if not correctly serviced.

Might be time to hire a certified professional.

Hope I'm helping!

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Nov 13, 2016 | Heating & Cooling

1 Answer

What's wrong with my furnace?

The relay for the motor is stuck or the points inside the relay are arced closed. Replace the relay.

Apr 26, 2016 | Goodman Janitrol Amana Goodman Janitrol...

1 Answer

Pilot light is lit but mAinburner will not

If it is a standing pilot, the knob that you had to depress to get pilot gas to flow has to be turned to the 'on' position from the 'pilot' position before main gas will flow.

If is a "spark to pilot" ignition the knob has no 'pilot' position on the main gas valve and the problem is elsewhere. There are many variations of ignition sequence and a little more input from what you have would be helpful.

Nov 18, 2014 | Heating & Cooling

1 Answer

Janitrol aircraft heater will not light

Janitrol heaters can be dangerous things and you should only mess with them if you know what you are doing. Since you have asked the question here, I might assume you don't know what you are doing and as such I would advise you to take it to a qualified technician. There was a case of a Janitrol heater exploding in flight, blowing the nose off a piper Aztec. Luckily for the pilot, the good old Aztec has a tubular metal frame at the front, which supports all the necessary structure including the nose landing gear. He was able to fly the aircraft and land safely, although it was a bit cold and draughty.
The Heater has a built in logic sequence. If any parameter fails it will not start. First it needs combustion pressure which is supplied by the fan. Then it will check the overheat switch and if it is cold enough it will start the ignitor. If all the ducks are in a row it will finally allow the fuel to be injected, but if the fuel pressure is not sufficient the fuel solenoid will not open. If the fuel is injected with no spark, any subsequent spark will blow it up. That is why you don't mess with it. Testing different items out of sequence can cause the item to stop or start at the wrong time. If at any time the start sequence is interrupted, the whole start sequence will start again from the beginning after at least one minute of purging air has been pumped through the unit by the blower fan. If the fan is tired or the airflow has been restricted or too much fuel is injected, the unit will overheat and will automatically switch off the fuel. The fan should continue to run, but generally a manual reset is required to alert the operator that an overheat condition existed and may still exist.

Hope this helps.
Rgs. Bob


Jan 03, 2014 | Other 15D73, Janitrol Aircraft Heater...

1 Answer

No spark to pilot for janitrol GUPI100-4. Installed new pilot assembley and a new ignition control board

did make sure you grounded new control board properly and gap for electrode set correctly??

Nov 18, 2013 | Goodman Heating & Cooling

1 Answer

Janitrol GUPS075-3 Furnace burners will not stay lit

The first thing I would do is make sure the flame sensor is clean, this is a metal rod immersed in the burner flame on the opposite side of the igniter. If too much oxidation builds up on it, it will not allow the burner to stay lit. To clean, just turn off furnace and remove flame sensor and clean with steel wool and then reinstall. If this does not solve the problem there may be a problem with the gas valve.

Nov 08, 2012 | Heating & Cooling

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No flame

Several steps here to check...
turn power off unit and back on
set thermostat to heat
watch for pilot to ignite..igniter should glow orange or cherry red or spark if its a spark type ignitor
Did you see a pilot light ignite?

If not you probably have a bad igniter.

If pilot a little bit you hear a click of the gas valve opening..then the main burners will ignite

If you see the pilot and the main burner lights but goes out in a few minutes or immediately you may have an issue of the "high limit" switch tripping.

Is the blower fan turning that blows air out of your vents?
are all your vents open in your house? too many times i see homes with almost all vents shut.

Jan 08, 2011 | Goodman GMS90703BXA Heater

1 Answer

The WeatherKing Forced air heater stopped working in my house. The thermostat could turn it on in terms of sound but when I looked at the heater, all I saw is the pilot light. No air, hot or cold, was...

You will need to relite the pilot if this is a standing pilot furnace........If this has an electronic lite for the pilot then cycle power to the furnace and set thermostat to heat. and retry sequence. Once you get the pilot to lite then watch it to see if the main gas comes on. if it doesn't then you need to check and see if you are getting 24 volts to the gas valve with a volt meter. If you don't feel comfortable with doing this then you will have done everything that is simple. You will have to call a service tech. Problems that it could be are gas valve, limits not closed, ignition control board, main limit open because the blowor motor locked up or motor has open winding or run capacitor open.

Jan 02, 2011 | Weather King Heating & Cooling

1 Answer

My heater will not light. It is eletric ignition, there is power coming into the unit.

In order for the furnace to light, a few things must happen. The thermostat must have a call for heat thus making a connection (closing a switch) sending a signal to a computer circuit board. The board will in turn blink a light indicating a call for heat is registered. It will then send power to a fan motor that will remove old air from the burner area and introduce fresh air to the burner. Once the blower comes up to speed, the pressure closes a a pressure switch. Once the switch closes, it sends power to an igniter, either a glow type or spark type. It also sends power to one side of the gas valve to open up the pilot gas valve and send gas to the pilot assembly. Once the computer senses there is heat at the pilot valve, it will open up the second gas valve and send gas to the main burner. The trick is to know where it is going wrong. First you must watch this sequence to follow the workings. To do this you may have to remove some panels on the furnace and hold a door switch closed temporarily to trick the furnace to run. Follow the sequence above to find where it ain't happening and look at what must be done to fix it. It could be as simple as a bad thermostat (no call for heat) or a plugged exhaust vent not allowing the pressure switch to close. Let us know how you make out with the diagnosis!

Oct 13, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Short cycling..continually..minimal heat

Is this furnace standing pilot or electronic? if standing pilot turn power off then take t-stat off wall and connect the wires labeled r and c together and see if that keeps furnace working. If electronic check flame sensor you can check flame sensor buy cleaning with steel wool. if that doesn't work then try t-sat.

Jan 21, 2009 | Coleman Propane Forced Air Heater...

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