im at a loss on this gas pack im working on. . .
i am trying to fix a Goodman gas-package unit.
serial # 0003668303
i went to a no heat call yesterday evening, and found a cracked heat ex-changer. i will note that it was a 3 cell type with a clamshell pattern.
it was blown out on the bottom and only half of the cell looked like it had ever seen heat ,. so ...... well im not sure but it was weird.
i got to the supply house this morning and picked up a new HX. put it in and started up the unit , it started up , ran for a few minutes and pow , off on HL.
ok i got this , inside to check filters , nope , clean as new .
then to the supply and checked coil , spot less .
IDFM 1.03 amps
INDUCER motor .008 amps .
hummm . bad limit , oh well , stick temp probe in hole and read a steadily increasing temp of 134, 155, 162, 170, 190, 212 deg. , okay whats going on.
checked duct work , un hooked both s and r air ducts , still kicking out high limit...
gas pressure in let = 8.5 in/wc
outlet or manifold pressures = 3.8 in/ wc , adjusted back to factory 3.5 in/wc.
now im stumped !
okay start over here . . . found busted gasket and slow motor on collector box , installed new one , still no good, high limit kick-outs occuring.
pulled gas manifold checked orfices , venturii , and pressures once more . . .
okay im done for the night , guys any help here ? im stunned by this units attitude and am not sure what my next move is . . .
so, if it were yours and replacement weren't an option what would you do next?
i need help on this matter , please !
also im sure the HX cracked at the very bottom from short cycling .