Fault Finding And Diagnosis; Fault Finding - Worcester Greenstar Ri Compact ErP Installation, Commissioning And Servicing Instructions

Fault finding and diagnosis

8 Fault finding and diagnosis
8.1

Fault finding

This fault finding information is for guidance only.
Worcester cannot be held responsible for costs incurred
by persons not deemed to be competent.
The electronic control system for this boiler incorporates a blue light on
the front fascia. This light indicates normal operation, but by flashing at
different rates during a fault, provides a guide to the cause as listed.
Faults that might develop with this boiler are either Blocking or Locking
faults:
Blocking faults will stop the boiler operating, once the fault is cleared the
Flashing fault codes
The flashing sequences will be split into three groups:
1. A five second "off" period (A), followed by a count of either 1,2,3,4
or 5 flashes (B), at a rate of 1 second on and 1 second off.
2. A five second "off" period (A), followed by 4 fast flashes (C), lasting
2 seconds, followed by a count of either 1,2,3,4 or 5 flashes (B), at
a rate of 1 second on and 1 second off.
A
A
A
Fig. 99 Fault flash timing
[A] 5 second off period
[B] period with 1 to 5 flashes
[C] 2 second period with 4 fast flashes
52
B A
C B A
B C A
boiler will restart automatically. This may mean waiting for the boiler to
cool down or waiting for a pre-defined time period.
Locking faults require manual intervention, for example pressing the
Reset button on the boiler fascia.
This fault finding system assumes that the appliance has been operating
normally until the time of failure (i.e. not a first installation error).
PRELIMINARY CHECKS: Preliminary electrical system checks are the
first electrical checks to be carried out during a fault-finding procedure.
On completion of the Service/Fault-Finding task which has required the
breaking and remaking of electrical connections, check:
(a) EARTH CONTINUITY,
(b) SHORT CIRCUIT CHECK,
(c) POLARITY and
(d) RESISTANCE TO EARTH.
3. A five second "off" period (A), followed by a count of either 1,2,3,4
or 5 flashes (B), at a rate of 1 second on and 1 second off followed by
4 fast flashes (C), lasting 2 seconds.
In all cases the sequences will be continually repeated after the 5 second
"off" period.
Group 1
Greenstar Ri Compact
Group 2
Group 3
6720646610-70. 1 Wo
ErP 6720813282 (2015/07)