I NEED SOME HELP YCD180 gas fired LOW HEAT ON A CHURCH

[pandatimer]

i need some help please i am at a job site emergency call low heat on a YCD180


has a regular t stat installed and inducer has been replaced and the rtrm board also (not by me)

someone available to help me PLEASE!!!!!

[jayguy]

How do I help? You have told me nothing other than you need help with a possible heat problem.

[buford]

Have you the self test mode?

[jtrammel]

nevermind, open forum...

[VTP99]

Does "low heat" mean 1st stage only or would that be, low as in temperature of the space ?

[Chuck]

Replace the rest of the parts

[jtrammel]

Replace the rest of the parts

X2, there's only a couple left. Then you can find the crack in the u bend of the heat exchanger and put all those parts on the shelf for stock...

[rider77]

What's a regular tstat?

[pandatimer]

ok i just got home (((((friggin cold))))) sorry i have been on this unit for a few hours ..... i will try to explain the best i can .......
this unit has had issues for a long time (found this out about an hour ago 6:30pm est)
they have had to reset this unit by cycling the power repeatedly to get it to work......sometimes once or twice....customer said lately(4mos) it has had to be reset 3-6 times to get it to heat.......

3 weeks ago it began this issue of running producing low heat...........other people have worked on this unit and gave up ...... my company sent me on this and now it getting personal.....(i hate not figuring things out) i have info downloaded to diagnose but some of the info does not jive with what i see and i don't have experience on these microprocessor units........ can i get some info?????? i have run the self test and CFM does not change speed
i had to change the ignitor ----- wouldnt sense flame.....green color hue visible on ignitor they said was changed 2 weeks ago

now it runs ----- "low output" wont heat to full temp have never seen a code flashed unless i unhooked.... temp sensors

there was a frequency modulator installed with 3relays(mars) and 1 contactor (these were removed by the last guy who worked on it.......

the ingintion board was replaced -(cust said it was burnt)
then the ignitor (both 6-7 weeks back)

then the CFM was bad and replaced by another company

the same guy removed the relays and F.M.

i come along and it will not start correctly------now it runs ----runs----runs ---- does not satisfy temp


i am real sorry but i am pulling my hair out on this ...... HELP and be patient please i am not a commerical trane tech but i am a residential tech Bryant/Amana

so any body still here ????? i can answer as to WHAT I HAVE LOOKED AT AND TESTED but i am not at the unit presently........ thanks for reading.....Bill





the ignition control board was

[VTP99]

What's a regular tstat?

Red/White/Yellow/Green

[pandatimer]

R-W1-G-Y1-W2-Y2-C
DOES NOT HAVE DIAG LIGHTS....as described in troubleshooting guide

[VTP99]

How about a model number for starts ?

[Chuck]

Gas pressure

[Chuck]

Did you say combustion fan runs all the time?

[pandatimer]

model #YCD180B3HOHB

i found the bulletin on the CFM shorting out and it HAS NOT BEEN DONE.......

8"wc SUPPLY SIDE
? unknown of CFM since its negative pressure..

[pandatimer]

Did you say combustion fan runs all the time?

only when heat is energized

[VTP99]

Did both stages of heat run in test mode ?

[pandatimer]

Did both stages of heat run in test mode ?

no i hear the relay click(on the board) but no change in CFM speed....

[chillerout1]

whats the pressure on the outlet side of the gas valve? what about the condition of the screen inside the burner where the ignitor is?

[pandatimer]

whats the pressure on the outlet side of the gas valve? what about the condition of the screen inside the burner where the ignitor is?

the pressure is negative(0"WC) on outlet side and 8"wc supply side...... and the screen had about 20 holes plugged i cleaned that and no change