With a 3-150 ton capacity range and efficiency ratings as high as 17.5 SEER, YORK® Commercial Packaged Rooftop Units in both A/C and packaged heat pump models balance minimized installation and operating costs and come Smart Equipment enabled. Next to the light is a NUMBER.
So I figured gas valve problem. The Unit Controller will retry the fan output every 30 minutes for three retires. The control will fl ash the alarm but allow the unit to operate normally.This alarm indicates a problem with the Unit Controller microelectronics has occurred and the Unit Controller is operating on default values. What do I look for?On the component map you should find a control marked FOVR (FAN OVERLOAD RELAY) of BOR (Blower overload relay).

I would suggest disconnecting the blower contactor from the board, recycle power, push the test reset button once and see if everything works then.

The IAQ sensor input is at terminal DV+ and DV-.

hi there. These procedures are the same for all 25-40 Ton Millennium® Rooftop units in this series except as noted. Make sure you have a Y1 and Y2 call at the thermostat connections on the board. Each compressor system is equipped with external circuitry monitoring hardware intended to protect the compressor in case the operating characteristics of the refrigerant system fall outside the safe operating envelope for the compressor. Board part # S1-33109150000. IfThe control monitors the limit switch status for each of the heating sections installed. blower is on and runningLimit trips could be caused by improper air flow, improper gas flow settings, overtired, dampers closed, dirtyvfilter, dirty blower, registers closed.thank you so much, but what i still don’t understand is why is the heat still working if the limit is open, isn’t it spouse to shut the burners right away and blower stays on ?As I said in my last response, I feel it would be best to call a qualified contractor at this point. This device is fi eld supplied.This alarm indicates the Unit Controller Real Time Clock is not functioning. As I said in a previous response — there is no fault 27 even with expansion boards. In some of my previous posts, I’ve discussed “flash code diagnostics” and the fact that these should be used as a “guide” to finding out where the problem is located. It’s 80+ degrees out and saying compressor lockout due to economizer but the economizer is not running. contactor wiring was removed during troubleshooting and put back in placeat the top of the board is the P5 plug. When this happens, and the door panel being removed makes the problem go away, it is a lack of sealing of the flue box during replacement. Thanks for the fast response!!! Code 13 occurs when voltage drops below 19+/- volts when running or below 16 +/- volts when trying to energize a component.

Am now working on a 24 000 btu split unit and the indoor unit becomes ON for a while and start flashing on the display, while system shut off all together. You know you have power at G because the fan runs. With a single stae stat, if in the econ mode there is no call for mechanical cooling if the econ cannot keep up.Correct, field installed Econ.


Both stages of cooling are calling second stage cycles on off first stage is locked out on free cooling . Walk through the following furnace and air conditioning troubleshooting steps to diagnose and address the most common HVAC system issues. YORK® ZJ Series Sunline Magnum™ /ZR Series MagnaDRY™/ZF Series Sunline™ units are convertible single package high efficiency rooftops. did you by pass the econ like I suggested? then you can see which safety is open8 to 10 time light flashing then start and stop the flash light continues flashing.. please provide the diagnosis code and also wiring diagramyou need to contact your local distributor for the wiring diagram or look on the doors — it is usually there in the unit..A “green” continuous flash on the upper LED is normal operationI am having problems with a FC7 code, what could be some likely causes for this code?FC 7 – Freeze stat trip on 1st stage.

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