heh, lets take a step back, relax, breath in, breath out and analysed the thing
the pedal has input, output and the delay circuit.
so as you were saying, you still can hear the clean sound, just not the effect delay sound. So what does this tell us?
That means geetar signal is still going in and coming out to the amp, but just not going to the delay circuit.
with the switching for the pedal, everytime when stepping on the footswitch, its supposed to route your geetar signal from input, to the delay ciruit, get process and pass out to the output.
and since it doesnt, that could mean the geetar signal is just passing directly from input to output. A possible problem would be in the fet switching area.
Of course that just a guess. Ultimately, theres nothing much the forum can do, other than bringing the pedal to effect tech and let them check the thing. Thats if you really wanna find out whats causing it and wanna solve the problem
If not, heh, there will be confusions if the thread proceed