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Ruud 90+ Model UGRA 10EZAJS Trips Out

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.

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  • Robert Kulick Feb 12, 2012

    Removed and sanded flame sensor. Yellow light came on several seconds after ignition. I will observe the furnace further over the next few days to see if that solved the trip out problem.

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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

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I would change the thermostat it maybe the issue if that doesn't help check the control board on the furnace

Posted on Feb 11, 2012

  • Robert Kulick Feb 12, 2012

    Thermostat is working fine. On startup the IFC board shows 2 green lights (OK & PWR). After about 15 minutes of continuous heating the yellow (flame light) comes on. I have seen the flame come up on a partial burn on occasion. When that happens the gas valve shuts down and the cycle repeats. On the 2nd try there is a full burn and the furnace blower kicks on. Gas pressure is 10-11"WC (propane).

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