Heating, Air Conditioning, Fridge, HVAC/Furnace Issue

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Question
I have an approximately 20 year old Intertherm furnace with an issue.  Previously it wasn't lighting up and I got the Gas Valve replaced and installed a new programmable thermostat but alas there is still once problem.  

So basically if the furnace is off and I switch the thermostat to HEAT, the electronic ignitor will light up, the gas valve opens, the gas ignites, the flame stays on and the furnace heats up until the thermostat reaches the programmed temperature.  After reaching the temperature the furnace fan goes off, the gas stops and the house is warm.  

The problem is that when the thermostat shows the temperature has dropped below the programmed temperature, the furnace is not re-igniting...I'm not sure why the furnace won't re-ignite or what is happening exactly.  If I go to the thermostat and see the temperature is below the programmed temperature and switch it off, then turn it back onto HEAT after 5 seconds, then the electronic ignitor will light up, gas turns on and fires up no problem.  It's just not automatically kicking in again when the temperature drops below the temperature I've programmed.  

Any thoughts as to what might be causing the furnace not to kick in after dropping below the designated thermostat temperature?

Answer
Thank you for your request.  Unfortunately our expertise is with Major Home Appliances only.  This would include washers, dryers, refrigerators, microwaves, dishwasher, ranges and ovens.  If you need help with any of these appliances, feel free to submit another request.  For your problem, please request assistance from a AllExpert with experience in the HVAC service field.  If you ever need assistance with Major Home Appliances feel free to come back and initiate another request.  Visit our Website at http://www.affordableappliance.com or email us directly at sales@affordableappliance.com

Thank You for your request,
Eric & Ann Campion

Heating, Air Conditioning, Fridge, HVAC

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Eric Campion

Expertise

We have been repairing appliances for over 36 years and have owned our own business for the same. We can help in any or almost all complaints or at least give you some intelligent input to help you make rational decisions. If maxed-out... You may visit our website at http://www.affordableappliance.com for quicker service.

Experience

30 years owning our business and repairing Major Home Appliances

Organizations
Chamber of Commerce. Better Business Bureau. Pottsville Business Association. EXPERIENCE

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36 Years of Working on Major Home Appliances and selling parts. Our office staff is top notched and is supervised by My Wife Ann who is also very experienced in the Major Home Appliance Service and Part Sales Business

Education/Credentials
My credentials can be viewed on my website at http://www.affordableappliance.com

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