Potterton envoy 30, Инструкция по установке и обслуживанию

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FAULT FINDING – DIAGNOSTIC DISPLAY – Page 27
DIGITAL DISPLAY
This boiler is fitted with a single digit display which is located
in the front control box behind the hinged door.
The display on which up to 30 different characters can be
illuminated performs two functions.
1. By displaying the following characters provides the user
with a visual indication of the current boiler operating
status.
Power supply switched on but waiting a call for heat
from secondary controls or boiler control switch is in
the “O” position.
Boiler operating, low flow temperature selected.
Boiler operating, high flow temperature selected.
Boiler operating but up to temperature.
Boiler restart delayed to prevent rapid cycling (max
delay time 5 mins).
Pump over run is operating.
FLASHING. Boiler at lockout.
DISPLAY NOT ILLUMINATED – all power off.
2. By displaying the following characters it will assist the service engineer by working as a fault diagnosing system.
Sensor Flow or return sensor out of calibration See chart
Flow sensor Flow sensor is incorrectly fitted Check sensor
Case temperature Temperature within boiler casing too high See chart
Dry fire Boiler has been fired without water Check system
Flow sensor Sensor failed open or closed circuit Replace sensor
Return sensor Sensor failed open or closed circuit Replace sensor
Case sensor Sensor failed open or closed circuit Replace sensor
Dry fire sensor Sensor failed open or closed circuit Replace sensor
Fan speed Fan speed incorrect See chart
Shorted signal Flame signal shorted to ground Check igniter etc
Flame loss Flame loss after initial detection See chart
Control failed Control has failed Replace control
Wiring fault Live on neutral connection Correct fault
Preliminary Test Diagnostics
All boilers are fully tested before leaving the factory, therefore, if an electrical problem is experienced it is very likely that this
is caused by faulty external wiring. If a problem exists disconnect all site wiring from the boiler. Connect a direct fused
electrical supply to boiler terminals L, SwL, N and E and pump live to terminal marked pump L, taking a temporary neutral
and earth connection for the pump from the boiler terminal block.
If boiler now operates correctly, site wiring should be further investigated.