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12
TROUBLE SHOOTING GUIDE
12.1
General guide
Symptoms
Probable Cause
Recommended Action
Pump will not
start
Insufficient gravity
flow
Check flow rate minimum of 0.8 l/min
required on full hot and cold
Electrical
Check power supply
Check fuse (see fuse section)
Check circuit breaker is set
Check wiring connections
Pump jammed
If motor ‘buzzes’ switch off power and
contact Bristan
Integral motor
thermotrip
activated
Wait for thermotrip to auto-reset and check
that duty point and run time is within
specification (see technical specification)
Reduced/
intermittent flow
Incorrect or no
anti-aeration
flange fitted
Check that the installation complies with
installation instructions
Incorrect pipe
sizes
Check for correct pipe sizing, see Section
4.4 - Pipework
Blocked inlet
strainer filters
Clean inlet strainer filters
Hot water
temperature set
too high
Reduce cylinder stat setting to 65 °C max
Blocked shower
head spray plate
Clean in accordance with manufacturers
instructions
No hot water
Air locked water
feed
Vent hot water pump of air
Check cold feed to hot water cylinder
Check water level in cold water tank and
that all stopcocks and isolating valves are
open
Heat source not
operating
Check boiler is switched ‘on’
Check cylinder thermostat
Check immersion heater
Check cylinder contains hot water
Summary of Contents for ST PUMP 15TN
Page 31: ......
