Hi all,
Have benefited much from forum until now, but time to join - first post.
Descaled my BZ99 over the weekend, just the usual routine. After finishing the descale, ran a few litres of water through for good measure. Toward the end of the process, the weirdness began.
First, water stopped coming through the group head. The pump was audibly under pressure so figured a blockage. Shut it down and removed some of the plumbing expecting some kind of gunk from the descale to be lodged somewhere, but nothing. Everything back together, and water running again.
Fired it up the second time, and now water from the steam wand (ranging from just water to intermittent water/steam spitting). Shut off the steam, pump charged the boiler and now the water started gushing from the safety valve and drain valve. Drained some water off from the hot water tap and observed for a little while.
After everything settled down again, tested the steam, group head and hot water for around an hour and everything seemed to find its balance again. So decided to test it by pulling a shot. Laboured for a few seconds, started to extract and then reverted to the old tricks - water out the top of the boiler and from the steam wand.
I feel like the issue is related to the level probes, but didn’t touch them, so nothing has changed. Perhaps the descale screwed something up??? A little lost on this one
. Any thoughts?
Btw, if I’m posting in the wrong place here, happy to be pointed in the right direction.
Have benefited much from forum until now, but time to join - first post.
Descaled my BZ99 over the weekend, just the usual routine. After finishing the descale, ran a few litres of water through for good measure. Toward the end of the process, the weirdness began.
First, water stopped coming through the group head. The pump was audibly under pressure so figured a blockage. Shut it down and removed some of the plumbing expecting some kind of gunk from the descale to be lodged somewhere, but nothing. Everything back together, and water running again.
Fired it up the second time, and now water from the steam wand (ranging from just water to intermittent water/steam spitting). Shut off the steam, pump charged the boiler and now the water started gushing from the safety valve and drain valve. Drained some water off from the hot water tap and observed for a little while.
After everything settled down again, tested the steam, group head and hot water for around an hour and everything seemed to find its balance again. So decided to test it by pulling a shot. Laboured for a few seconds, started to extract and then reverted to the old tricks - water out the top of the boiler and from the steam wand.
I feel like the issue is related to the level probes, but didn’t touch them, so nothing has changed. Perhaps the descale screwed something up??? A little lost on this one
. Any thoughts?Btw, if I’m posting in the wrong place here, happy to be pointed in the right direction.

. Really appreciate everyone’s input. Will pull out and clean the solenoids for a start and see what results.
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