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Service recall Dining room unit RTRM locked out again No diagnostic output pulse for pins 7,8,9, or 10. The fact the board is locking out without indicating the nature of the fault leads us to believe the board is intermittently failing. Recycling the power restores full functionality. Showed the store manager where the breaker is to reset the unit.
Dining room unit locked out again. Cannot pinpoint fault. We need to get on the phone with trane tech support when they are open during the week. Unfortunately, we cannot diagnose the issue without an active fault. Resetting the power clears the fault and allows the unit to operate normally through a series of full cooling cycles. Both compressors run, no frost on the suction lines. Condensate is draining properly. Unsure how much run time trips the lockout fault. Showed staff where the breaker is so they can work through the issue if it happens again this weekend.
Confirmed equipment was in hard lock out on service code 2 flashes on the RTRM LED 2. The ignition module was not calling for any heat therefore no diagnostic LEDs or flash codes and normal operation only on the RTOM driving the plenum fan assembly Confirmed y1 and y2 cooling calls with no operation of any modes. Per tech support, lock out #2 could be related to any add-on accessories, cooling mode, or heating mode. Diagnostics can only be led in one direction with DC voltage testing during lockout. After resetting the equipment all systems appeared to run normal. Cycled system back and forth at least 3 to 4 times between heating and cooling and high and low stages. All operation appears normal Air filters are an acceptable condition Repaired loose connection at the flame sensor and resurfaced sensing rod. Confirmed high stage cooling mode running at 39°
RTRM board flashing code 2 "system lockout" Reset the power, heat came on immediately. Space got from 65⁰ to 71⁰ in roughly 45 minutes System has two heating stages and two cooling stages. Both were wired to run only in high heat or high cooling Changed the wiring and the thermostat setup for 2 heat and 2 cool control. Coils are clean Filters are OK Blower running normally Cannot find any issues with the heating side of the unit. It is too cold outside to run the cooling mode today and test for proper operation.
Upon arrival the front lobby/Bar system was displaying 80° indoor temperature set to 72 in cooling Initial roof inspection found the system running in high stage heating and short cycling on primary limit with a confirmed call for stage 1 and stage 2 cooling at y1 and y2 of the RTRM Suspect possible intermittently failing RTRM or faulty ignition module relay failing to disengage heating mode After power cycle and multiple retries through hot wires and thermostat demands the system is running normal in cooling mode. And the thermostat has lowered from 80 indoor to 72 with a new set point of 68 If system fails to cool again the RTRM will need replaced
Replace filters. Perform heating maintenance. Clean flame sensor. Inspected heat exchanger no concerns with the unit.
Perform heating PMI. Replace filters clean flame sensor inspect heat exchanger no concerns with unit.
Replace filters and clean flame sensors heat exchangers new this year
Gas heating preventative maintenance performed Check filter - 20x25x1 new today Clean flame sensor Ohm test igniter: 56.7 no concerns Gas pressure - 3.22 1.39 Inspect wiring for loose connections and/or hot spots - none found Check humidifier pad: n/a Water flush pump and add drain tablets Inspect exhaust flu - no concerns Set thermostat for heat Check amp draw on blower motor: 3.42 Check amp draw on inducer motor:0.98 Check delta T - 58° Furnace is in optimal running conditions
Replace both drain pans on RTUs and replace high limit for kitchen unit. Rebuild broken drain trap.
Kitchen thermostat was set to 64 degrees and dining room was set to 70. Both were indicating 70 degree room temperature. Thermostats were also set to follow a schedule. Put them both on a permanent hold. Got on the roof, both units are heating normally at this time. Possible misread of set point and room temperature on the thermostats.
Replace both heat exchangers for the RTU units at Harvest Quote two new drain pans, and a new limit for kitchen unit standing on filter sides of unit the right one.
Upon arrival was informed of RTU2 fire alarm went off minutes before arrival. Did not discover any causes or concerns on smoke alarm circuit, RTU on West side needs the heat exchanger replaced, unit has began forming holes in the bends and is becoming unsafe to operate. Installed CO detector in harvest by the bathrooms. Quote for heat exchanger is currently being discussed with Justin.
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Blower wheel inspection on 2018 Trane roof top unit in Bexley, OH.
