I have a 6 year old Glowworm Ultimate (not sure which model), its been
fine, today no hot water, but the radiators are fine.

When I turn up the central heating thermostat I see/hear the boiler
light, but when I run the hot water nothing, just cold water.

The control set by the boiler (honeywell) appears ok, pushing the boost
or putting the HW onto 24hr doesnt alter anything.

My thinking was that their must be some sort of pressure switch/
thermostat combination - but boilers are not something I have tackled
before.

Any help/advise welcome

piv wrote:
I have a 6 year old Glowworm Ultimate (not sure which model), its been
fine, today no hot water, but the radiators are fine.

When I turn up the central heating thermostat I see/hear the boiler
light, but when I run the hot water nothing, just cold water.

The control set by the boiler (honeywell) appears ok, pushing the
boost or putting the HW onto 24hr doesnt alter anything.

My thinking was that their must be some sort of pressure switch/
thermostat combination - but boilers are not something I have tackled
before.

Any help/advise welcome

divertor valve stuck or broken ?

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In message .com, piv
writes
I have a 6 year old Glowworm Ultimate (not sure which model), its been
fine, today no hot water, but the radiators are fine.

When I turn up the central heating thermostat I see/hear the boiler
light, but when I run the hot water nothing, just cold water.

The control set by the boiler (honeywell) appears ok, pushing the boost
or putting the HW onto 24hr doesnt alter anything.

My thinking was that their must be some sort of pressure switch/
thermostat combination - but boilers are not something I have tackled
before.

Any help/advise welcome

Probably the diverter valve motor died

Do you know what and where this is ?


--
geoff