Hot water flow intermittent now zero

hezwez, Aug 5, 9:45am
I see there are a few threads here but can't see exactly our problem. Three days ago the hot water flow stopped/started/stopped but from tonight ~ zilch. We have a gas hot water cylinder. What could be wrong? Thanks

aredwood, Aug 5, 11:52am
Probably failed tempering valve.

hezwez, Aug 5, 11:52pm
Thanks aredwood. Waiting for plumber now, will let you know whether you're on the money.

fantail2, Aug 6, 6:26am
How is your plumber progressing

hezwez, Aug 6, 12:05pm
He was perplexed. Is coming back tomorrow.

aredwood, Aug 8, 11:16pm
Did he sort it? Other possibility is if the gas cylinder is a ridiculously old one that is fed by a header tank - could be an air lock.

fantail2, Aug 10, 8:57am
has he fixed it then.

hezwez, Aug 11, 12:42am
No. He twiddled and it came back on ~ but it had been doing that anyway. Off again since yesterday and I've been in touch again.
ETA no aredwood it's not that old. Maybe 20 years?

lythande1, Aug 11, 3:31am
That is ancient.,

hezwez, Oct 29, 8:59pm
Line strainer replaced. OK at the moment.