Williams Medi+ LWMP620 Operating Manual page 12

TROUBLE SHOOTING / ALARM CODES
TROUBLE SHOOTING INFORMATION AND ALARM CODES
Fault Display
Cabinet not operating
Cabinet not maintaining
temperature
Faults displayed by control
TROUBLE SHOOTING INFORMATION FOR THE MAINS POWER SUPPLY FAILURE ALARM
(OPTIONAL)
Fault
The sounder is not working
when mains power supply is
turned off
The red 'Power failure'
indicator is not illuminating
when mains power supply is
turned off but the sounder
activates
The sounder and red indicator
not working when the mains
power supply is turned off
The sounder and red indicator
only work for a short period
when the mains power supply
is turned off
12
Possible Cause
No power supply
1. Dirty condenser
2. Air circulation restricted
3. Defective fan motor
4. Defector compressor relay
5. Loose electrical connection
E1 or E2 - Control probe failure
HI or LO - High/low temperature
alarm*
DO - Door open alarm
CL - Condenser requires cleaning
Possible Cause
Mute switch activated
Indicator not working
Battery or alarm circuit faulty
Battery requires full charge or
requires replacement
Action
Check fuse or power source
Clean
Remove restriction
Call engineer
Call engineer
Call engineer
Call engineer
Call engineer
Shut door
Remove cover and clean condenser
fins with a clean brush
Action
Check mute switch
Call engineer
Call engineer
Call engineer if a full charge does
not resolve the issue