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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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My ruud achiever 90 plus heating unit will not run. I have

Customer Question

my ruud achiever 90 plus heating unit will not run. I have set the thermostate to heat and run the temp up to where it should come on. I took the panels off to see the indicator lights the power light comes on and stays lit the second light comes on for about 7 or 8 seconds then it goes out and starts blinking 2 times. it will blink for about a minute and then go out for 5 minutes. ruud model rcfl-hm4821ac
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: i changet the filter and double checked the thermotate settings
JA: Do you plan on doing the work yourself?
Customer: yes
JA: Anything else we should know to help you best?
Customer: i have checket the pressure switch and also checked the power out of the voltage reg. it seems to be fine
Submitted: 8 months ago.
Category: HVAC
Expert:  Gaztech replied 8 months ago.

Welcome to Just Answer, my name is Luke

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Customer: replied 8 months ago.
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Customer: replied 8 months ago.
my ruud achiever 90 plus heating unit will not run. I have set the thermostate to heat and run the temp up to where it should come on. I took the panels off to see the indicator lights the power light comes on and stays lit the second light comes on for about 7 or 8 seconds then it goes out andstarts blinking 2 times. it will blink for about a minute and then go out for 5 minutes. ruud model rcfl-hm4821ac.
i changet the filter and double checked the thermotate settings.
i have checket the pressure switch and also checked the power out of the voltage reg. it seems to be fine
Expert:  airheatman replied 8 months ago.

Two blinks indicates the pressure switch is not closing. Does the small vent motor come on as soon s you call for heat?

Customer: replied 8 months ago.
Expert:  airheatman replied 8 months ago.

OK next do this. Take the hose loose from the inducer and leave attached to the pressure switch.Start furnace and as soon as inducer vet motor starts, begin sucking on the hose and see if pressure switch will close and ignite furnace