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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a rheum classic 90 plus. it will click on when it

Customer Question

hi... i have a rheum classic 90 plus. it will click on when it gets the signal from the thermostat but it will only send cold air briefly and then shut off.
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: i double checked the thermostat settings but did not check the filters. i've never replaced the filters before... i'm a bit nervous to troubleshoot myself.
JA: Do you plan on doing the work yourself?
Customer: as long as i know what i'm doing, i don't mind... i've just never opened it up before
JA: Anything else we should know to help you best?
Customer: not that i know... it's happened before in the past and the professional came to service it and now it's happening again.
Submitted: 8 months ago.
Category: HVAC
Expert:  airheatman replied 8 months ago.

There is a control board in blower compartment with 2 green lights and an ***** *****ght.Look and tell me what the lights are doing. (EX middle light flashing 2 times then pausing)

Customer: replied 8 months ago.
the two green lights on the right are lit. the light on the left is not lit.
Expert:  airheatman replied 8 months ago.

OK turn thermostat to call for heat and watch lights.If furnace fails to light the middle green should flash giving us an error code indicated by number of flashes between pauses.

Customer: replied 8 months ago.
2 flashes in between pauses
Expert:  airheatman replied 8 months ago.

Ok does the little inducer vent motor where vent attaches come on?

Customer: replied 8 months ago.
i think so.
Expert:  airheatman replied 8 months ago.

OK next does the ignite light?

Customer: replied 8 months ago.
i don't think so because it's only blowing cold air.
Expert:  airheatman replied 8 months ago.

OK if igniter glowed or sparked you would not know just based on not blowing warm I need you to verify each thing I ask 100 per cent to know how to guide you. You will need to listen for the little motor, then look in top panel to see if igniter glows or sparks. Not being rude, but I think so or pretty sure, will not allow me to help troubleshoot.

Customer: replied 8 months ago.
okay. i will take a look. sorry, i was unaware how to check.
Expert:  airheatman replied 8 months ago.

No problem hopefully we can get it figured out

Customer: replied 8 months ago.
i turned the thermostat off and back on, the igniter lit for about 10 seconds and then went out.
Expert:  airheatman replied 8 months ago.

OK the next thing that should happen is gas valve should open. Do you hear a click from the solenoid on the valve? Also do you have a multimeter to see if we are getting 24v to valve?

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