3
1. Quick Guide to Trouble shooting
This section outlines the most common problems and helps to guide you through the rest
of the workshop manual.
(Read this section first, before you make any adjustments. It
will save you time.)
CHECK HOT WATER SYSTEM FIRST, BEFORE THE CENTRAL HEATING CIRCUIT
HOT WATER SYSTEM
Here are some common problems:
GAS REGULATORS
Single appliance low capacity gas regulators plus 3/8” flexible low pressure pipe, will
reduce the efficiency dramatically. Ensure gas regulators and pipes are capable of
delivering 37mbar at the inlet under full load. A 2.5mbar drop is acceptable.
WATER FILTER
Check for contamination with foreign objects such as sawdust, plastic pipe swarf, etc. The
water filter is located inside the cold water inlet fitting under the boiler. Any blockage will
reduce flow and may prevent the boiler firing up.
HOT AND COLD WATER CONNECTIONS
Connections may be reversed at the boiler inlet/outlet fittings, resulting in the boiler failing
to commence ignition sequence. This is because the hydraulic valve operates in one
direction only.
THERMOSTATIC SHOWER MIXER VALVE
Faulty non return valves within the mixer tap may allow mains cold water to enter the
domestic hot water pipe work. The boiler will react to the situation according to the
amount of mains water entering the system. In severe cases a high percentage of mains
cold water will exit the hot water tap in place of hot water, as water will always take the
path of least resistance. This will result in no hot water flow, or a very restricted flow
through the boiler. This will result in no ignition occurring or the boiler will modulate at very
low gas pressure, followed by the boiler eventually shutting down as insufficient flow
passes through the boiler.
Summary of Contents for FEB-24E UK
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Page 26: ...26 Central Heating Logic Programme Figure 1 Figure 2 ...
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