How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Phil Your Own Question
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
23932409
Type Your HVAC Question Here...
Phil is online now
A new question is answered every 9 seconds

My Lennox pulse 21 starts up upon thermostat demand. The

Customer Question

My Lennox pulse 21 starts up upon thermostat demand. The heat continues for about two minutes the the igniter begins to struggle and shuts off before desired room temperature is reached. After a few minutes the igniter turns back on until room temperature is reached. What causes this?
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: I have a new air filter, I replaced the flapper. The thermostat does not shut the igniter off because the room temp is not reached.
JA: Do you plan on doing the work yourself?
Customer: If it is simple. Could it be a plugged condensate trap? I hear water drips in the main pipe?
JA: Anything else we should know to help you best?
Customer: Not sure
Submitted: 1 month ago.
Category: HVAC
Expert:  BillyHvac replied 1 month ago.

Hello,

My name is ***** ***** I will do my best to assist you. I am looking over your question now and will respond shortly.

Expert:  BillyHvac replied 1 month ago.

when was the last time the spark plug and flapper membrane were replaced?

Expert:  BillyHvac replied 1 month ago.

These use a spark plug like a car.

They have long been discontinued and parts are getting a bit harder to get and more expensive.

This furnace is different than any other unit as it requires "tuneups" like a car does.

Here is a tuneup kit parts list

Let me know last tuneup date and we can go from there