Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.

trane

Paul S_3
Paul S_3 Member Posts: 1,257
I went to a no heat call on a 10 ton(gas) TRANE 2 stage packaged unit(model#YHC120e).i think i found a faulty 2 stage 24v gas valve. I would like some insight with this diagnosis. This unit has (1) circuit board which is for heat.....the inducer motor will start @ high stage then switch to low (1st) stage  ,it will make the pressure switch and then the spark ignitor will start sparking....it will attempt to energize the gas valve(low or 1st stage) for a split second then the board will de-energize(sparking from board is for a split second too)...it seems like the gas valve's coil is shorted or something wrong with it and the board de-energizes asap....i disconnected the wires to the 1st stage gas valve coil and put my meter to it ....the sequence of operation is the same except that the heating board is energizes the wires to the GV continuously (spark ignitor stays on longer too)until it locks out.......has anyone experienced these TRANE circuit boards operating similar???? it seems like the board recognizes a problem with the coil on the GV....
ASM Mechanical Company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company

Comments

  • unclejohn
    unclejohn Member Posts: 1,749
    Sounds like

    You got it. You might just connect a 24v relay where the gas valve was to see if its just not a bad wire connection inside a harness. If it takes the load of the relay and keeps sparking like before when you just disconnect the wires I'd go for the valve replacement
This discussion has been closed.