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Furnace will not engage pressure switch (rated -1.11) on the…

Customer Question
Furnace will not engage...

Furnace will not engage pressure switch (rated -1.11) on the port of the draft inducer it reads -2.1) 3 pressure switches have been tried and new hoses. Amps on motor are .72. Flue is open, draft inducer is clean heat exchanger is clean, all drains are open and working

Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters?

T-stat is turned all the way up, filters are clean

Contractor's Assistant: Do you plan on doing the work yourself?

I’m a contractor and Rheem technical support is closed

Contractor's Assistant: Anything else we should know to help you best?

Gas valve, burner tubes and board have been replaced

Submitted: 7 months ago.Category: HVAC
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Answered in 20 minutes by:
12/26/2017
HVAC Technician: Gaztech, HVAC Technician replied 7 months ago
Gaztech
Gaztech, HVAC Technician
Category: HVAC
Satisfied Customers: 937
Experience: Owner at Gaztech
Verified

Hi I amCustomer a independent technician, I will assist you with your issue.

Don't forget to rate the 5 star rating AT THE TOP OF PAGE if we are done. this will credit me for assisting you

Is it proane or nat gas

Things to check

  1. Obstructed intake or exaust pipe, use a shopvac outside where pipes ends.
  2. You may have a blocked secondary hear exchanger
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Customer reply replied 7 months ago
Propane...
exhaust and supply air are open sometimes (once a day) the burner tubes don’t fully light then the second time it will. I get a -2.1 at the port on the draft inducer housing. But once the hose is installed I only get a .97 or so. Tried different hoses and same deal.
Customer reply replied 7 months ago
Air are open. Sometimes
HVAC Technician: Gaztech, HVAC Technician replied 7 months ago

How old is unit

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HVAC Technician: Gaztech, HVAC Technician replied 7 months ago

You need to do a gas pressure test

  1. Inlet of gas valve should be approx 10.5 to 11wc
  2. outlet when gas valve opens 10- 10.5 wc

If pressure was off for a long period of time bad combustion may have obstructed secondary heat exchanger.

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HVAC Technician: Gaztech, HVAC Technician replied 7 months ago
I noticed question is still opened and unrated please dont forget the 5 star rating if we are done Sincerely
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