23 | P a g e
1P4 Description: System pressure low.
Cause: system pressure is below 1 bar; boiler continues to operate at a system pressure between 0.7 and 1 bar with
a warning in the display.
1. Check pressure loss patterns with the consumer and if any work has been carried out on the system or
boiler.
2. 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.
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.).
1P9 Description: No pump kick detected.
Cause: No pressure increase detected while the pump is running at full load for 5 seconds. This can be caused by air
in the boiler, a blockage in the boiler, faulty pressure sensor or a faulty pump.
1. Check analogue and digital pressure readouts match.
• If these do not match add pressure to the system and check digital gauge reads new pressure.
• Clean sensor if contaminated or replace as required.
2. Use a multimeter to check the wiring harness to the water pressure sensor for continuity from PCB
connector CN12, pins 6, 7 & 8, whilst checking connectors are tight and free from damage or corrosion.
• Replace as required.
3. Check DC voltage from pressure sensor back to the PCB on connector CN12, pins 7&8. The voltage should be
as per the table below. Clean or replace the sensor as required.
To Next Page
Loading...
Need help?
General
