9 | P a g e
118 Description: Water pressure too low (<0.8 bar to 0.5 bar) or no pump kick
detected.
Cause: Insufficient water pressure in system, blockage in boiler, pump not operating or water pressure sensor faulty.
1. Check analogue and digital pressure readouts match. If these do not match add pressure to the system and
check gauges read new pressure. Replace as required.
2. Check pressure loss patterns with the consumer and if any work has been carried out on the system or
boiler.
3. Check the heating system for leaks (system needs to be cold and may need to be over pressured to force
leak).
4. Ensure adequate expansion for property.
5. Check the boiler for leaks including removal of the siphon to check heat exchanger for leaks.
6. Check the pressure relief valve for leakage.
7. Check expansion vessel flexi hose is correctly connected with no kinks or blockages.
8. Check expansion vessel pressure is set correctly as per the manufacturer’s instructions, and check Shrader
core for leakage.
• Water in the expansion vessel may only be condensation and can be removed using the
expansion vessel service procedure found on page 68.
• Check expansion vessel not leaking, replace as required.
• If the expansion vessel is of adequate size for the property, is not leaking and has been fully
serviced but not holding pressure, replace the expansion vessel.
9. If no obvious leaks are found, isolate boiler from system and leave on test.
• *Note* system must be cold, and pressure set to approx. 1.5 bar before isolating valves from
boiler to system.
• The time required for this test will depend on patterns and amount of pressure loss. (i.e., every 2
days etc.).
119 Description: Link missing on wiring harness.
Cause: Link on PCB connector X2 missing.
1. Check connector connection to PCB.
2. Check link is in pins 4 & 5 on X2.
3. Check wiring harness.
4. Replace parts as required, if all the above is ok, replace PCB.
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