Testing the boilers Air Pressure Switch
, is always an indicator that other problems may exist. This article helps to diagnose the Air Pressure Switch
issues on a boiler.
Air pressure switches
(operating @ approx. 0.5 – 4 m/bar pressures)
See also: How to test your Air Pressure Switch
with a multimeter
Reasons an air pressure switch
will fail to start:
Loose electrical connections
Kinked or split rubber h...
Boiler Fault Finding - Thermostats - See also:
Thermostats Overheat Cut out
Thermostats Liquid Expansion
Electrical Safety Checks - Resistance to Earth
Top Tips for the Heating Engineer...
What is a thermistor
used for in a combi boiler
Reasons a fan will fail to start
No 240V supplying (L) & (N) terminals Burnt out motor windings Worn out bearings Air rotor jammed (on fan casing) impeller heavy with foreign matter accumulation Faulty fan speed control resistor (if fitted) ...
A failure of the circulating pump
can cause a number of problems, such as reduced heating and hot water
performance, and can result in the boiler shutting down.