The Gledhill PulsaCoil....
The Gledhill PulsaCoil is Gledhill's simplest and most popular thermal store.
(For extensive information I have a separate website for PulsaCoils specifically
PulsaCoils provide hot water only (at mains pressure), PulsaCoils are heated by electricity
only. They have two immersion heaters. One for regular night time heating using
cheap rate Economy Seven electricity, the other for daytime boosting should you
use up all the stored heat during the day.
If you have a PulsaCoil that isn't working, there are two things you can
check as a user:
1) The unit is actually full of water. There will be a top-up tank incorporated in the top of the unit (or fitted separately above). The water store
NEEDS to be full of water and some need to be manually filled/topped up. Make
sure this top-up tank is filled with water, because then the thermal store will
be full too.
2) The overheat protection device may have tripped. You can re-set it
yourself on many models. Some have two overheat trips. Read the user instruction
booklet (usually in a pocket on the front of the unit) to find it (them). You
may need to remove the front panel to access the reset button.
Other things that go wrong (for which you'll need an engineer) are the
immersion heaters fail occasionally, the overheat thermostats need upgrading to
prevent repeated tripping, the thermistor flow sensors fail, and earlier models
have a mechanical blender valve that breaks when water scale accumulates inside
it. Less common problems are circuit board failure, scaling of the plate heat
exchanger, or (on early models) scaling of an internal heat exchanger that
needs chemical descaling to cure.
I've published a separate website covering these in depth: www.pulsacoil-repairs.co.uk
You'll find detailed help and advice for owners and repair engineers.