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I have a furnace and i just replaced a combonation hsi sensor and after i did the gas valve wants to open the second the hsi starts to glow but then two seconds later the gas valve opens and closes and opens and closes VERY DANGEROUS WHY IS THIS HAPPENING I have 28 Volts going to my gas valve and it is steady

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Was this a direct replacement sensor os was ther rewiring possible short

Posted on Jan 06, 2009

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Gas furnace short cycles 2 minutes or less. Multiple troubleshoot steps and replaced components - no help. Any advice?


I did not see that your indoor fan motor started. Near your indoor fan motor there is a temperature switch that is called the fan delay relay. On a temperature rise the relay shuts a contact that turns on the indoor fan motor. If the contact does not close the high temperature limit will shut the gas controls off like your getting. A fan delay relay also allows the fan to run a minute or so to carry away the remaining heat in the furnace and help cool the furnace down. The fan delay relay is normally mounted in a recessed area in the fire wall of the furnace plate. I have also seen them on the top of the furnace heat exchanger. Anyway, the fan delay relay will probably not be available on a sunday, so temporarily until parts are available, try turning the thermostat fan from auto to on and try the furnace again. By turning on the fan to on the high temp limit will not shut you down again.

I have had high temp limit change there trip points, but you said you bypassed it and did the same thing.

Another cause could be using the wrong type of air filter. The new pleated filters sold block to much air flow. If air mass flow rate drops the difference in temperatur go up and when the difference in temperature go up, it gets nearer the high limit and causes it to trip. All pleated filters drop normal air flow through ducts by at least 35%. To make your air duct system work properly use the what is called throw away filters which cost about 1/3 the cost of the pleated filter. Remember to either clean or change the throw away filter monthly to reduce dirt being drawn into your duct system.
Hope this helps.

Feb 13, 2015 | Heating & Cooling

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Kenmore gas dryer 80series model 110.c72852101


if you hear the valve clicking but no gas the valve is bad.when the burner lights theres a probe that senses that it is lit and sends a microvoltage back to the controller to tell its lit.check to make sure all ground wires are grounded to a clean metal surface.

Oct 03, 2007 | Kenmore 74602 Gas Dryer

1 Answer

Heater won't turn on even with a good HSI


Remove at least one of the wires going to that solenoid on the gas valve. Check for continuity between the 2 legs of the solenoid. If you cannot get a reading then you have a bad valve. If you indeed do have continuity start the furnace and see if voltage is going to the valve. If you have no voltage going to the valve then you could have a bad board. If voltage is going to the valve then the gas valve has failed internally or you ain't paid the gas bill. LOL.

Jan 06, 2012 | Heating & Cooling

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I CAN´T START A JANDY


This is the code for ignition lock-out.
This lock out typically happens when one of three things happens. I will start with the most common problems.

1. The HSI (hot surface ignitor) has gone bad. (this is easy to fix once you have the part. Part number is : R0457500

2. Flame sensor (rectifier) has gone bad or curroded and flame is not being sensed. This is also an easy part to repair. Part number : R0458600

3. Gas valve has gotten sticky or gone bad (this is not likely) . If this is the case, I recommend a professional replace the gas valve.

Open the cabinet so you have a good view of the ignitor. turn the power off, wait 30 seconds, then power back on.
After about 45 seconds the heater will send power to the HSI and it should glow bright orange/red.
If this i snot happening, its probably a bad ignitor.
If the ignitor glows, and the flame ignites, but goes out immediately, this would indicate a bad flame sensor. If you need help locating these parts in the heater, refer to the original manual.
http://www.jandy-downloads.com/heaters_lxi_manual.pdf
All parts are available on-line.
Or you can e-mail me @ adamh@newconceptchem.com to see if i have them in stock.

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1 Answer

Goodman GMP075-3 not igniting. Everything cycles as it should but HSI does not glow. Thermostat is set to heat, temp approximately 10 to 15 degrees higher than room temp, blower motor starts, relay clicks...


The flash code is due to the furnace not proving flame 3 times in a row. If you have a multimeter you can ohm the ignitor out to see if it is good. Depending on the type (silicon Nitride or silicon Carbide) you can verify if it is good. A silicon Nitride ignitor looks like a small thin straight bar type will ohm @ 11 - 18 ohms, a carbide ignitor looks kinda like a tuning fork (sorta) will typically ohm @ 40 - 92 ohms. anything outside of those ranges will require a replacement.

Nov 02, 2010 | Goodman GMS90703BXA Heater

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My Goodman GSMS 100-4 won't stay lit. It starts up the HSI glows, gas valve opens ignition, flame and after a few seconds the flame goes out. The light blinks one time (repeating). I replaced the flame...


Hello Flame rod should have done the trick.Make sure the rod & the control are GROUNDED (earth).Make sure the rod is not touching anything & in the gas flame.

Sep 22, 2010 | Goodman Heating & Cooling

1 Answer

My goodman heater will not run all of the sensors check out ok and have voltage the vacuum switch is also working I am getting one blink after the furnace shuts back down,there is no voltage to the...


This is a step system for heat ,,, step 1....... thermostat calls fo heat and send power to the vent fan motor, it proves its running by a small suction on the red tube which closes a switch and tell the c. b. to go to step--2 lite the hsi this glows &in20 seconds....step --3 the gas valve opens and dump raw gas in the venturis tubes.. and proves it has a flame thru the flame sensor. and step 4... the box heats up and closes the fan switch..

Dec 20, 2009 | Goodman Heating & Cooling

2 Answers

Bad control board?


This is a good one! I would check for a blocked vent or intake pipe first. Also check to make sure the condensate lines are free of moisture or debris. What is the code for three blinks?

Oct 11, 2009 | Goodman GMS807034ANA Heater

1 Answer

HSI ignitor is glowing red but furnace isn't lighting every time


most likely the gas vavle only buy honeywell valve the rest are junk

Jan 08, 2009 | Jenn-Air JED8230 Electric Cooktop

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I have a Westinghouse Freestyle 472 gas oven that wont light. The igniter seems to start glowing, the fan runs and the grill works but no gas seems to flow.


remove burner see if a hole is melted on glowing ignitor end repair with s/s welding if ok replace ignitor hsi assy w/o old 1 may appear ok but resistance values are out gas valve wont open if still dont work replace valve thermal hsi single should replace both these item anyway.this is assistance advice only do at own risk it worked for me madog cheers.

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