Gaggia Titanium Espresso Machine "hooking water heaters together" Questions

water heaters don't run, but they work when I power them individually, the grinder works when I power it up, but nothing works when hooked up to the circuit board except the water pump when I turn the

...water/steam plastic hose that comes in. replace the valve, hook up the two hoses, but back in housing and you're done. attach back to knob on the outside, put back together and in 30 minutes, the ...

...water/steam plastic hose that comes in. replace the valve, hook up the two hoses, but back in housing and you're done. attach back to knob on the outside, put back together and in 30 minutes, the ...