Digital dual power supply unstable amps on channel two

[SydLynx]

Hi folks, I bought a replacement for my defective, now returned, linear dual voltage power supply, and tested it today.

It's an Aim TTi EX354RD 280W digital dual power supply (I believe it's most commonly knows as switching power supply).
Anyway, as soon as I switched it on, I noticed that the CC led light of the right-hand channel did not come on, at zero current setting, as the left-hand side one did.

Thus, on the left-hand side display, the current sits at zero amps, stable zero digit, whilst on the right-hand side the last digit on the CC display keeps fluctuating between zero and one, hence the CC led not coming on, because there's some current flow (inside the power source? maybe a short?), although there's nothing connected to the terminals outside, and all the pots are turned all the way left, to zero. I believe it might be defective?

Otherwise, measuring the voltage, it seems quite accurate, to mVolts. On both channels.

I bought it off eBay, at the stupid price of £295 (I saw it on Farnell at around £600 new). Seller said it's never been used, he bought it for a project that never reached fruition. And it does look new, no signs of previous use tbh.

Should that amp level fluctuation be the reason why he sold it?
Thanks for any helpful opinions!



Edit: After I finished formulating my question here, I switched the power source on again, and... now both channels fluctuate, between the digits zero and one, on the CC display, both pot levels left and right all the way to minimum, but now happily, and strangely, both CC leds are also on. Right-hand side still didn't come on at first when I powered it on. It took it about three seconds to come on, without my doing nothing, just looking at it.

Probably has something to do with the inner components needing some time to.. warm up, or the capacitors to... I don't know.. get some charge? I probably sound extremely dumb, but I'm miles away from real electronics, I'm just learning the thing.

[pqass]

Without anything connected at the terminals...
if you set the voltage knob to, say 5V, then slowly adjust the current knob downward to 0A, you will find that before you reach full counter clockwise that the CC LED will kick-in and the voltage display goes to 0V.  That's what I see on my HP E3611A. 

If my PS was off for a couple of days, the CC LED kicks-in at 100mA but after 20 minutes warmup, turning the knob CCW, CC kicks-in at 10mA (the E3611A only has 2 decimal digits display for current).  I attribute that to the internal voltage reference warming up and the CC comparator isn't precisely calibrated at the very bottom.  It's not expected that these lab supplies have the sensitivity to limit single-digit mA loads.