ZP3-ECU Maintenance Manual Doc. No. 503-0800ZE-M-01
Issue 1 (01/08/2006) Page 9
Relay not Responding
This fault is raised when the ECU double knock relay does not switch when required. The relay is
mapped as an output that is activated by a triggered input.
Indications
• Fault buzzer sounds.
• Display scrolls between two events, one showing the addressable relay device that has not
switched, the other showing the event that has triggered it (usually a fire event). For example:
FIRE Zone 001 Dev 001 Event 001
Second Floor, Laundry Room
RELAY FAULT Zone 001 Dev 086 Event 002
• Events are printed (if printer configured).
• Zone in which the relay fault occurred is indicated by the appropriate red Zone LED.
Possible Causes
• ECU double knock relay is in an isolated state.
• ECU double knock relay is faulty.
Corrective Actions
1. Press the ACCEPT button to accept the fault.
2. If the yellow Isolated LED is on, check whether the relay is isolated. If the relay is isolated then
investigate the reasons for this. De-isolate the relay if it is safe to do so.
3. If no other reason can be found for the fault, replace the faulty ECU main board.
4. Reset the panel.
Device Type Fault
When the system is commissioned the panel notes the device type at each address. If this type
should subsequently change then the panel raises a device type fault.
Indications
• Yellow Fault LED is lit.
• Fault buzzer sounds.
• Event is shown on the display, for example:
TYPE FAULT Zone 001 Dev 001 Event 001
Second Floor, Laundry Room
• Event is printed (if printer configured).
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