Question about Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: central heating thermostat
Looks like it was replaced by the CM67 series, try this link for the manual:
Posted on Feb 29, 2008
Check the flame sensor near the ignitor....it could just be dirty. Check that first. Check the electrical connections to it. Also, check the flame sensor's position. It must be within the correct proximity of the ignitor to tell the gas valve to open. Make sure the gas is on to the unit.
Posted on Mar 15, 2009
turn off the electricity. unhook the two wires going to the heater. Hook up a meter to the two connectors. set the meter to ohms and ohm the heater out. If it has an open in it replace the heater.
Posted on May 25, 2009
This does not sound like a thermostat problem. I would be looking for a zone valve or circulator pump problem.
Posted on Nov 12, 2009
I have the same boiler with a similar issue. The water is more than likley leaving the system from the pressure relief valve, which will be routed outside. It sounds like you have lost the pressure in your expansion tank, which is inside the boiler. With the boiler pressure at zero and the power isolated, the expansion tank can be accessed from a panel at the top of the boiler on the right hand side. You will see a valve on the red expansion vessel like the one on a car tyre and can be pressurised with a car tyre air pump. I think from the manual the pressure should be about 1 bar, but it depends on the length of pipework on your system. A competent boiler engineer should be able to sort this out, but it may be that your valve is leaking, or the expansion vessel has failed and the problem will occur again.
Posted on Jan 03, 2010
Tips for a great answer:
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In most cases problems with the circulator pump boil down to two problems.
The most common is air in the lines causing an air lock.
The next problem is that the pump gets stuck and is not running even though it may be hot and seem to be running. In this cause the pump can sometimes be taken apart, cleaned and it will work, but usually it needs to be replaced.
Here is a tip that I wrote that will explain circulator pump problems in more detail.
Heating Circulating Water Pump Problems
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