Troubleshooting; Before Engaging In Troubleshooting; Overview - Toshiba MMY-MAP0806HT8P Service Manual

8

TROUBLESHOOTING

8-1. Overview

(1) Before engaging in troubleshooting

(a) Applicable models
All Super Module Multi System (SMMS-e) models.
(Indoor units: MM∗-AP∗∗∗, Outdoor units: MMY-MAP∗∗∗6∗)
(b) Tools and measuring devices required
• Screwdrivers (Philips, flat head), spanners, long-nose pliers, nipper, pin to push reset switch, etc.
• Multimeter, thermometer, pressure gauge, etc.
(c) Things to check prior to troubleshooting (behaviors listed below are normal)
N O .
A compressor would not start
1
An indoor fan would not start
2
An outdoor fan would not start or would
3 change speed for no reason
An indoor fan would not stop
4
The air conditioner would not respond to a
5
start/stop command from a remote controller
CAUTION
The cooling performance may decling considerably when total operating capacity of cooling indoor units is
less than 4 HP WHILE AMBIENT TEMPERATURE IS BELOW 0°C.
(2) Troubleshooting procedure
When a problem occurs, proceed with troubleshooting in accordance with the procedure shown below.
Problem
Investigate check code
displayed on interface P.C. board
of header unit
NOTE
Rather than a product trouble (see the List of Check Codes below), the problem could have been caused by
a microprocessor malfunction attributable to a poor quality of the power source or an external noise. Check
for possible noise sources, and shield the remote controller wiring and signal wires as necessary.
B e h a i v r o
• Could it just be the 3-minute delay period (3 minutes after compressor
• Could it just be the air conditioner having gone thermostats OFF?
• Could it just be the air conditioner operating in fan mode or put on the timer?
• Could it just be the system going through initial communication?
• Could it just be cold air discharge prevention control, which is part of
• Could it just be cooling operation under low outside temperature
• Could it just be defrosting operation?
• Could it just be the elimination of residual heat being performed as part of
• Could it just be the air conditioner operation under external or remote
"E28" check code
P o s
shutdown)?
heating?
conditions?
the air conditioner shutdown process after heating operation?
control?
Investigate check code
displayed on interface P.C.
board of relevant follower unit
Any other problem
− 160 −
s b i e l c a u s e
Check the problem
site or problem part