Question about Jandy Laars Lt 400,000 Btu Heater
Check for 24 volt at gas valve when you turn it on if 24 volt replace gas valve if 24 replace ign module
Posted on May 26, 2009
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remaing solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.
What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).
Oct 05, 2010 | Goodman GMS90703BXA Heater
Mar 05, 2010 | Goodman GMS90703BXA Heater
Mar 04, 2010 | Heating & Cooling
Feb 15, 2010 | Intertherm P3RA-048K Air Conditioner
Jan 26, 2010 | Goodman GMS80453ANA Open Flame Mid-Size...
Jan 03, 2010 | Goodman GMS90703BXA Heater
Nov 23, 2009 | Coffee Makers & Espresso Machines
Nov 23, 2009 | Heating & Cooling
Nov 20, 2009 | Carrier Heating & Cooling
Nov 19, 2009 | Goodman GMS90703BXA Heater
132 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: