need help - Bryant Evolution Hi Therm Cutout

Discussion in 'HVAC Heating & Cooling' started by tom-rad, Nov 8, 2013.

  1. tom-rad

    tom-rad New Member

    Messages:
    23
    Location:
    Maryland
    Having some trouble with my two speed compressor - it's a Bryant 698B, installed exactly 8 years ago. First problem, my installer is no longer working on them. I'm on my own to some extent, and due to extremely limited funds (out of work), have to troubleshoot this as much as possible by myself. Hope someone here knows these systems. It's cold, and the electric backup is expensive.
    First symptom, back in the summer, the a/c worked but a few times, I heard either a contactor or relay chattering. Sounded like something stuck in the fan, but no. It would eventually stop chattering. The system worked, but I was concerned.
    Anyway, first functional problem was several weeks ago, turned on heat (all electric, by the way. FE4A air handler with electric coil and 698B heat pump). Noticed, after several hours, the 'system malfunction - call technician' error was displayed. I checked the error codes, and had:
    HI THERMAL CUTOUT
    HI COMP
    LOW THERMAL CUTOUT
    VC VOLTAGE
    So, I reset by turning off breakers. Unit comes on, seems ok. But, got the error again. So, I go out and listen and notice the compressor tries to come on (in High stage), runs for about 10 seconds, then kicks off.
    I shut off the breakers, then took the cover off. Noticed the 25uf run capacitor was swollen. I measured it, it was open. So, ordered one and replaced it.
    Started unit, low stage compressor seemed to be running. I think, anyway. Same deal with the high stage, it would chatter a little and then kick out after about 10 seconds.
    So, I guess maybe the HI STAGE contactor? Ordered one. Replaced it. Same issue.

    The most prevalent code seems to be HI THERMAL CUTOUT.
    Here's the numbers:

    (32 events) HI THERMAL CUTOUT
    (20 events) LO THERMAL CUTOUT
    (18 events) VC VOLTS (the currently active fault)
    (8 events) HI COMP

    Sometimes HI THERMAL CUTOUT is the active fault event, and other times it's VC VOLTS. Most often it's HI THERMAL CUTOUT.
    I'm wondering if the start relay is stuck (contacts stuck), does that happen often? I didn't check it when I had it open earlier, was sure the contactor was the trouble.
    Thanks for any advice. As I mentioned, I usually have an HVAC tech do the work, but the guy I know is not doing them any more, plus I'm not working so really can't afford to call anyone if I can do the work myself (not being cheap, trust me, just poor and cold, lol).
    Thanks very much.
Similar Threads: need help
Forum Title Date
HVAC Heating & Cooling Need help on which air conditioning system to install Mar 31, 2014
HVAC Heating & Cooling Humidifier Bypass Duct Placement Help Needed Jan 10, 2014
HVAC Heating & Cooling Need help with Aprilaire 400M Humidifier, cannot open Saddle valve for water Dec 13, 2013
HVAC Heating & Cooling A small church needs help Nov 13, 2013
HVAC Heating & Cooling Replacing Furnace - Need help on recommendations Feb 15, 2013

Share This Page