Tip & How-To about Heating & Cooling

How to perform your own $139 "tune up" on your furnace, for close to free!

Any modern type furnace made after 1978 will have a imtermittant pilot as opposed to the old standing pilot our water heaters still use today
(thank god!) They also dont have any belts, pulleys, or oiling ports as in days of yarn, the motors are sealed for life typically, and if a cheaper quality type unit is used then they will have two oiling ports, onthe fan motor itself, 1 of which will be readily acessible anyways so oiling 1/2 the motor isnt a real benefit to you for your dollar spent to have done as a symbolic gesture as if a witch doctor etc! To access the oil ports would require removing the blower housing and motor from blower housing as well and if I ever have my unit that far down, I will simply buy a newmotor for 50-75 bucks and forget about it for another decade rather than reinstall the old and end up paying some gypsy 400 bucks to change it out in 2-5 years in all probability, There are no ways to test the safeties as everyone says they do, and some really do,. but what that means is they fire up your unit with the fan unplugged and run it to see if the hi limit safety trips ever or not !! theymay take it up to meltdown and it trips and
they sayy ok limit checks out good ,even though it opened at 850 rather than 150 !! torture testing it to be sure!! it may be a test but is it sabotaging the unit to prove nothing !! yes it is ! manually advancing a limit to test it alsocan break it as its a simple bimetal coil that spirals andas it expands and contracts fromheat it snaps a switch for fan i heat mode as well as opens a hi limit safety if temps go too high!so simply twisting it to prove the switches work may prove the switches work when twisted , but doesnt mean they do from heat accurately or that twisting bimeatls manually can break them and ruin them!!

So most of the fallacies of the tune up we covered , Now we go to reality and actual benefit to you and the unitand not a raz ma taz softshoe shuffle of a tech who is likely told 300$ a call min or he willbe gone soon! regardless of how good he is , i fact the best techs may maje a company less cash as he is fixing others callbacks and notcredited for the real repairand time etc, ad extra unneeded parts mean more $ for the shop! so oil the inducer draft motor at the burner area, remove the tubing frothe pressure switch (small disclike size of coke can bottom aprox w/2 wires) check hose for cracks ,leaks . moisture trapped, and the orifices the tubing attached to, especially onyhe inducer motor housing , needs to be reamed out with a small drill bit toclean out carbon etc, that is cause of 1/2 the calls with these type furnaces, remove, replace the air filter, and if you are using the high efficient type lifetime dustless type air filters, they are real good at cleaning the units air, but they slow down the air to the system by 1 ton of air or refrigerati ! and as typical home unit is 2-5 tons that is a big deal! a 3 ton sytem with high eficiency filter willhave 2 tons of air rather than 3 as needed to operate! so use the toss away 99 cent see through types and change monthly,! that alone is the biggest difference you will ever make on your equipment!

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how do you light the furnace of a goodman ez 1625


We have not lit pilot lights ourselves since 1978 when they outlawed standing pilots in Ca for furnaces. We have electronic ignitions of spark oror hot surface ignition, neither of which can be manually lit.
Do you get any fan action if you flip the fan on from auto?if so, you have power and 24v control power too, I would start there.

Oct 31, 2012 | Goodman Heating & Cooling

1 Answer

Pilot light on Intertherm MG 075A furnace will not stay lite on windy days. Worked fine for 20 years but has been a problem the last couple of winters. thermocoupler has been replaced a couple of ti


If this really is a thermocouple unit with a standing pilot, it must be pre 1978, I would suspect a crack in the exchanger first off as thats potentially lethal, not a joke, many heart attacks, headaches, fibromyalgia etc comes from undiagosed carbon monoxide exposures!
And many die from it sadly as it is 100% preventable, a detector would be advised even if you are ok there. A draft can be from the roof car ruting out or misssing? any dryer, Jennair, bath fan, water heater, stove top and many hvac systems create negative pressure in the home by exhausting air and not returning any or less than removed, as in a leaky supply duct leaking in the attic, the furnace pulls X cfm and returns Z
and fireplaces etc will backdraft. gas valves do get tired too.

Oct 31, 2012 | Dayton Gas Furnace Heater

1 Answer

heater doesn't come on?


The electronic ignition system in a gas furnace is a modern development that allows more reliable performance than standing pilot furnaces, provides energy savings and contributes to better furnace efficiency (AFUE). With a standing pilot, found most commonly on older low efficiency furnaces (55% to 65% AFUE is not uncommon), a small gas flame is always burning and is known in the lexicon of American home repair as a "pilot light". The problem with this type of "analog" ignition is that it wastes energy by constantly burning gas and can sometimes be unreliable. These issues have led to the development of electronic ignition systems for mid to high efficiency furnaces that exceed the U.S. government's established minimum AFUE rating of 78%. The electronic ignition occurs typically in one of two ways:
  • Intermittent Pilot, or
  • Hot Surface Ignition The intermittent pilot system uses an electronically controlled high voltage electrical spark to ignite the gas pilot and then subsequently the main burners, when the thermostat calls for heat.
    The hot surface ignition system uses an electronically controlled resistance heating element not unlike a light bulb filament (and shown in the photo above), to ignite the gas burner.
    It is important to understand some of the other components of a modern furnace that you will encounter depending on the type of high efficiency furnace you have. Why? Because they can also come into play in repairing an electronic ignition furnace when it won't run properly. Let's take a quick review of the types of furnace designs and components found in high efficiency furnaces using electronic ignition.
  • Nov 14, 2010 | Goodman GMS90703BXA Heater

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