MARK/(15,20) PROBLEMS: - Refer to this chart and the MARK/(15,20) PROBLEM
CASES (next page) to help diagnose problems based on the MARK/(15,20) readings.
CASE
BATTERY
VOLTAGE
READING
ARRAY
CURRENT
READING
YELLOW
LIGHT
GREEN
CHARGED
LIGHT
OTHER MARK/(15,20)
NOTE
(Below)
1 →
Display blank Display blank Day See Note 1
2 →
Display blank Display blank Night only See Note 2
3 →
10-13 00.0 OFF Day See Note 3
4 →
12.0-14.7 00.0 ON ON Day See Note 4
5 →
13-14.7 00.0 ON Day See Note 5
6 →
14.7 - 22.0 ON See Note 6
7 →
ON at night
Night See Note 7
8 →
Reading
changing
rapidly
Reading
changing
rapidly
May be
flashing
May be
flashing
Day See Note 8
9 →
Bad Display
Readings
Bad Display
Readings
See Note 9
10 →
Voltage reading
higher than
actual battery
voltage
See Note 10
11 →
Current less
than expected
Day See Note 11
12 →
Changes to
ON or OFF
Changes to
ON or OFF
Day – When fuse is
touched
See Note 12
13 →
Day -MARK/(15,20)
buzzing
See Note 13
14 →
MARK/(15,20) hot See Note 14
15 →
Bar-Graph off See Note 15
16 →
Fuse keeps blowing
See Note 16
MARK/(15,20) PROBLEM NOTES (from MARK/(15,20) PROBLEMS chart)
MARK/(15,20) Note 1 - A display blank both day and night may indicate…
• A bad connection exists to the solar panel (See BAD CONNECTION: PANEL (Help Note #8)) and the
battery has either a bad connection (See BAD CONNECTION: BATTERY (Help Note #9)) or the battery is
low in voltage (the meter requires 10 volts to operate).
• The MARK/(15,20) is defective. See CONTROLLER DEFECTIVE (Help Note #13).
MARK/(15,20) Note 2: - A display that is only blank at night may indicate…
• A bad connection exists to the battery. See BAD CONNECTION: BATTERY (Help Note #9).
• A blocking diode or diode isolator exists in the battery connection. If there is a blocking diode, remove it. If
there is a diode isolator, modify the system so the MARK/(15,20) charges only one battery bank.
MARK/(15,20) Note 3 - A low voltage condition with no daytime charging may indicate…
• The system has no panel input. See BAD CONNECTION: PANEL (Help Note #8)
• The charge set-point has been set very low. See INCORRECT VOLTAGE SET-POINT (Help Note #11)
• The MARK/(15,20) is defective. See CONTROLLER DEFECTIVE (Help Note #13).
TEST: Perform the BATTERY FUSE REMOVAL TEST (Page 18)
MARK/(15,20) Note 4 - The “CHARGING” and “CHARGED” lights on, is caused by a bad battery connection. See
BAD CONNECTION: BATTERY (Help Note #9).
16
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