Question about Ruud Heating & Cooling
Ruud 90+ Model UGRA 10EZAJS is started up in the the morning by setting the tstat to 66 F (actual room temp 59-60 F). Furnace starts and runs fine for a long time (30-40 minutes) as the home temperature climbs to about 63 F - 64F. Then the furnace goes through what appears to be a reset where the flame drops out, the air circulates for a few minutes then the flame tries to come back on. The gas valve cycles open/closed several times but only a partial flame comes up. After several tries the furnace goes into safety lockout and will stay down for 30 minutes. Then the furnace restarts and runs fine the rest of the day. The problem only appears in the morning at first startup. I thought it might be an overtemperature issue. I checked airflow and it is at around 1500 SCFM. Gas (propane) pressure is good. Flame sensor was replaced, gas valve is new. Orefices and gas distribution tubes are clean. Pressure diaphragm switches are new. Furnace filter is clean.
Check for condensation buildup in the Induction Blower housing. The condensate tubes or canister may be blocked and causing the diaphragm switch to trip the unit out causing the burners to shut down.
Posted on Nov 09, 2012
When unit fails check gas pressure maybe too much demand
Posted on Jun 20, 2018
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Posted on Jan 02, 2017
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