F09
or
9*
Circulation
pump defec-
tive
2
Glow plug de-
fective
• Defective pump or wiring
2
• Defective glow plug or wiring
• Check pump operation and wiring
• Check glow plug operation and wiring
Thermo 230/300/
350
Thermo 50
Thermo Pro 50 ECO
Thermo 90 ST
Thermo Pro 90
F10 or
10*
Temperature
limiter defec-
tive/overheat-
ing
2
Overheating
• Temperature limiter defective
2
• Heater overheating
• Overheat protection defective
• Replace temperature limiter
• Check coolant level/bleed coolant
• Check coolant pump operation
• Check temperature protection wiring
• Check operation of overheat protec-
tion, replace as necessary
Thermo 230/300/
350
Thermo 50
Thermo Pro 50 ECO
Thermo 90 ST
Thermo Pro 90
F11
or
11*
Igniter box
defective
2
Circulation
pump defec-
tive
• Defective igniter box/elec-
trodes
2
• Pump wiring
• Defective pump
• Replace igniter box/electrodes
• Repair wiring
• Replace pump
Thermo 230/300/
350
Thermo 50
Thermo Pro 50 ECO
Thermo 90 ST
Thermo Pro 90
F12
or
12*
Heater lock-
out
2
• Repeated malfunction or
flame-out
2
• Main battery switch defective
• Repair cause of malfunction
2
• Check wiring for damage
• Check battery disconnector
Thermo 230/300/
350
Thermo Pro 50 ECO
Thermo Pro 90
F13
or
13*
Operation of
vehicle fan
defective
Vehicle fan
short circuit
• Wiring
• Vehicle fan relay defective
• Check wiring for damage
• Check vehicle fan relay operation
Thermo Pro 50 ECO
Thermo Pro 90
F14
or
14*
Overheat sen-
sor short cir-
cuit
• Wiring
• Overheating protection sen-
sor defective
• Check wiring for damage
• Check overheat protection for proper
operation
Thermo Pro 50 ECO
Thermo Pro 90
F15
or
15*
Glow or
ignition ele-
ment circuit
defective
• Wiring
• Glow plug defective
• Check wiring for damage
• Check operation of glow plug
Thermo Pro 50 ECO
Thermo Pro 90
F16
or
16*
Exhaust gas
temperature
high
• Exhaust gas temperature sen-
sor defective
• Heater fouled
• Check wiring
• Check operation of exhaust gas tem-
perature sensor
• Check burner and heat exchanger for
fouling
Thermo Pro 50 ECO
Thermo Pro 90
F17
or
17*
Exhaust gas
temperature
sensor open
or short cir-
cuit
• Wiring
• Exhaust gas temperature sen-
sor defective
• Check wiring for damage
• Check operation of exhaust gas tem-
perature sensor, replace if necessary
Thermo Pro 50 ECO
Thermo Pro 90
* - Indicator lamp of control element flashing: number of long flashes after 5 rapid flashes
** - Were applicable
1 - Thermo Pro 50 ECO
2 - Thermo 230/300/350
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