Just arrived back from hols to be told "the boiler is making funny
noises".its a Mexico C60 type with the usual boiler adjustable thermostat
controlling the gas valve-recently replaced.
There is no air in the system-atmopheric type-not closed system.
When the system calls for heat the boiler emits fairly impressive noises and
the expansion pipe gets mighty hot after a few minutes.
Could the boiler thermostat be open circuit or does it not pass current when
it fails.
All suggestions will be appreciated.

"tom patton" wrote in message
o.uk...
Just arrived back from hols to be told "the boiler is making funny
noises".its a Mexico C60 type with the usual boiler adjustable thermostat
controlling the gas valve-recently replaced.
There is no air in the system-atmopheric type-not closed system.
When the system calls for heat the boiler emits fairly impressive noises
and
the expansion pipe gets mighty hot after a few minutes.
Could the boiler thermostat be open circuit or does it not pass current
when
it fails.
All suggestions will be appreciated.

If all checks out then use "Fernox" decaler. Flush out properly after and
use inhibitor. Replace inhibitor every 3 to 4 years.

Could the boiler thermostat be open circuit or does it not pass current
when
it fails.

A failed pump is a very common cause of this. Other pipe blockages, perhaps
from failed zone valves are another, but less likely, cause.

Christian.

On Fri, 15 Jul 2005 11:52:19 +0000, tom patton wrote:

Just arrived back from hols to be told "the boiler is making funny
noises".its a Mexico C60 type with the usual boiler adjustable thermostat
controlling the gas valve-recently replaced.
There is no air in the system-atmopheric type-not closed system.
When the system calls for heat the boiler emits fairly impressive noises and
the expansion pipe gets mighty hot after a few minutes.
Could the boiler thermostat be open circuit or does it not pass current when
it fails.
All suggestions will be appreciated.

I'd go for the pump, it might only be stuck as it lay unused while you
were away. However it is probably on its way out.

The end of the pump motor has either a black plastic knob or a chromed
plug with a large slot in it.

In both cases unscrew and then use the knob to unjam the pump or the newly
exposed screw slot under the plug.

expect a little (filthy) water to come out.


--
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