OWNER’S MANUAL
MODEL DH1-1010 SERIES – HEATED HOLDING UNIT
174830 RV101917
Copyright © 2017 Marshall Air Systems, Inc.
All Rights Reserved.
6
PROBLEM
POSSIBLE CAUSE
SOLUTION
3. UNIT NOT HEATING
D. SOLID STATE RELAY
HAS DC VOLTAGE,
NOT ALLOWING
POWER TO PASS
THROUGH
D. REPLACE SOLID STATE
RELAY
E. HEATING BLANKET
WIRES HAVE POWER
NOT HEATING
E. LOOSE WIRES, REPLACE
HEATING BLANKET
4. LOW PRODUCT
TEMPERATURE
A. TEMPERATURE SET
POINTS ARE TOO
LOW
A. ADJUST TO HIGHER
TEMPERATURE SET
POINT (SEE
PROGRAMMING
SECTION)
B. EXCESSIVE AIR
DRAFT(S)
B. SHIELD DRAFT(S)
5. HIGH PRODUCT
TEMPERATURE
A. TEMPERATURE SET
POINTS ARE TO HIGH
A. ADJUST TO LOWER
TEMPERATURE SET
POINT (SEE
PROGRAMMING
SECTION)
6. UNIT FLASHES
“+Pr”
“LO” (TEMPERATURE
LOW)
A. EXCESSIVE AIR
DRAFT(S)
A. SHIELD DRAFT(S)
B. LOOSE WIRE IN
ELECTRICAL
CABINET
B. CHECK WIRING
C. BAD TEMPERATURE
SENSOR
C. REPLACE SENSOR
D. BAD SOLID STATE
RELAY
D. REPLACE SOLID STATE
RELAY
E. BAD HEATING
BLANKET
E. REPLACE HEATING
BLANKET
7. UNIT FLASHES
“+Pr”
“HI” (TEMPERATURE
HIGH)
A. BAD SOLID STATE
RELAY
A. REPLACE SOLID STATE
RELAY
B. BAD TEMPERATURE
SENSOR
B. REPLACE
TEMPERATURE SENSOR
C. BAD CONTROLLER
C. REPLACE CONTROLLER
8. ERROR CODE:
"OPN" "UP" OR "LO"
“OPEN
TEMPERATURE
SENSOR”
“
uP” UPPER DECK OR
“LO” LOWER DECK
A. TEMPERATURE
SENSOR WIRES
BECAME
DISCONNECTED
A. RECONNECT
TEMPERATURE SENSOR
WIRES
B. BAD SENSOR
B. REPLACE SENSOR
C. BAD CONTROLLER
C. REPLACE CONTROLLER
