Quick Mill QM67 - Power light / PID comes on, but nothing else happens

November 7th, 2021, 10:02 pm

Hi all!

I'm new to troubleshooting espresso machines

I have a QM67 Evo that when I turn on nothing happens -- the red power light comes on and PID (computer display) turns on but there's no heat and I don't really hear anything else coming on (pump etc.) -- there is a "click"

I've read through some other threads on here and it seems like with other Quick Mills there were issues with transformers or the relays -- I tested the voltage coming out the solid state relay to the heating element and when the machine is on, the voltage coming out of the T1 terminal only reads ~27 volts or so which seems low, I don't know if the heating element runs on DC or AC so not sure what that voltage should be but there's 110 going to the L1 terminal.

Any suggestions on what to test next?

Thanks for any insight or suggestions!

November 7th, 2021, 10:10 pm

One other detail, the light does come on the relay

#3: Post by **Jeff** » November 7th, 2021, 11:12 pm

Many European home-intended machines seem to gloss over thermal design of their electronics. The SSRs don't like being hot and tend to fail long before their time.

I've also seen and heard of other's machines that have hot/neutral reversed, so take that into consideration as you test.

The heating elements are line-voltage AC. Depending on the model, the SSR could have inputs that are DC, low-voltage AC, or line-voltage AC. The indicator may light with just control applied.

Replacement relays can be cross-referenced, if not replaced exactly, by electronics suppliers like Mouser, Digikey, ... at significantly less than an espresso specialist.

#4: Post by **JRising** » November 8th, 2021, 12:03 pm

Jeff wrote: The heating elements are line-voltage AC. Depending on the model, the SSR could have inputs that are DC, low-voltage AC, or line-voltage AC. The indicator may light with just control applied.

The led indicator will certainly light with just control applied, regardless of the load.

If there's no voltage across your heating element, check the phase side back through the safety thermostat, SSR, and connections to the Powerboard.
Similarly check the neutral side back through its thermostat (if it has) back to common blue connections with the components that do work (if they do).

If the machine is signalling the SSR to heat the boiler, the machine seems to believe it's working normally. Does the pump work? When you say "Nothing else happens" other than heating, what should be happening? Should the boiler be filling or is it already full? If you pull the probe-wire, does auto-fill work?