15 | P a g e
180 Description: Boiler is in chimney sweep (service) mode.
Cause: No fault. Chimney sweep will run for 15 minutes and clear. If doing this constantly, replace PCB.
181 Description: Boiler coming out of chimney sweep (service) mode.
Cause: No fault. This code shows when boiler comes out of chimney sweep mode. If doing this constantly, replace
PCB.
SE Description: Time error
Cause: Timer needs reset via boiler display.
1. Push the DHW minus button, the Reset button, and the CH minus button simultaneously.
Spanner symbol Description: Blocking error or service mode.
Cause: The system pressure is low, or the boiler is in service mode. This will clear when the pressure is addressed, or
the boiler is out of service mode.
Pump constantly running.
Cause: Frost protection active or pump PWM fault. Sometimes linked with 118 fault codes, if so PWM fault.
1. If a frost symbol is present in the boiler display, follow from point 2. If there is no frost symbol on the
display, follow from point 4.
2. Check if boiler has been put into a manual frost protection. This can be turned off by pressing both minus
buttons together for 6 seconds. The frost symbol should disappear. If not, proceed to step 3.
3. If the temperature is less than 5 °C, then the internal frost protection is active.
i. Confirm the resistance of the T1 flow sensor as per the table on page 67 and replace as
required.
ii. Confirm the wiring harness continuity and contacts are ok. Replace if required.
iii. If the above checks are OK, replace the PCB.
4. Check the PWM signal to the pump is ok by completing the following:
a. Safely isolate the boiler and remove the PWM cable from the pump. Check the pins are not bent – if
bent use a small screwdriver to straighten.
b. Check pump position in relation to the PCB casing. If this is too close it can put pressure on the
PWM connector causing a loose connection. This is usually diagnosed by bring the PCB housing
down towards you and the pump may stop – adjust the pump position if required.
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