Hi,
I've got a Honeywell programmer controlling my central heating and ho****er.
The power to it comes from a swiched fused spur. This is fitted with a 3A
fuse.
About every two weeks the 3A fuse blows.

I'm assuming the programmer is faulty, but before I replace it, could there
be anything else causing the 3A fuse to blow?

Thanks
Peter

In article ,
"Peter" writes:
Hi,
I've got a Honeywell programmer controlling my central heating and ho****er.
The power to it comes from a swiched fused spur. This is fitted with a 3A
fuse.
About every two weeks the 3A fuse blows.

I'm assuming the programmer is faulty,

Why?

but before I replace it, could there
be anything else causing the 3A fuse to blow?

Boiler, pump, diverter valve, thermostat, interconnect cabling...

--
Andrew Gabriel

Ahhh...not as easy I a first thought.
I didn't realise the mains power to the programmer also fed other parts of
the system. I assumed (wrongly) that the 3A spur only supplied the
programmer itself!


"Andrew Gabriel" wrote in message
.. .
In article ,
"Peter" writes:
Hi,
I've got a Honeywell programmer controlling my central heating and
ho****er.
The power to it comes from a swiched fused spur. This is fitted with a
3A
fuse.
About every two weeks the 3A fuse blows.

I'm assuming the programmer is faulty,

Why?

but before I replace it, could there
be anything else causing the 3A fuse to blow?

Boiler, pump, diverter valve, thermostat, interconnect cabling...

--
Andrew Gabriel

On Mon, 17 Oct 2005 19:31:49 +0000, Andrew Gabriel wrote:

In article ,
"Peter" writes:
Hi,
I've got a Honeywell programmer controlling my central heating and ho****er.
The power to it comes from a swiched fused spur. This is fitted with a 3A
fuse.
About every two weeks the 3A fuse blows.

I'm assuming the programmer is faulty,

Why?

but before I replace it, could there
be anything else causing the 3A fuse to blow?

Boiler, pump, diverter valve, thermostat, interconnect cabling...

With electric faults on heating systems the pump is centre stage and then
some unless the boiler is leaking water into its controls.

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html

On Mon, 17 Oct 2005 18:46:11 GMT, Peter wrote:

I'm assuming the programmer is faulty, but before I replace it,
could there be anything else causing the 3A fuse to blow?

Yes, anything fed via the programmer, like the room and tank stats,
the pump, the boiler or any bit of rodent nibbled wiring betwixt all
that lot.

--
Cheers
Dave. pam is missing e-mail