T
HERMO
90 / 90 S
5TROUBLESHOOTING
5-3
Failure Symptom Probable Cause Remedy
8 Flash pulses (F 08) Wiring Check wiring for damage, open
(combustion air fan) connections or short circuit
Combustion air fan defective Replace replace combustion air fan
9 Flash pulses (F 09) Wiring Check wiring for damage, open
(glow pin) connections or short circuit
Glow pin defective Replace glow pin
10 Flash pulses (F 10) Coolant circuit Check coolant level
(temperature limiter Bleed coolant circuit
Thermo 90 S only) Reset temperature limiter
Wiring Check wiring for damage, open
connections or short circuit
11 Flash pulses (F 11) Wiring Check wiring for damage, open
(coolant circulation pump connections or short circuit
Thermo 90 S only) Coolant circulation pump defective Replace coolant circulation pump
Fig. 5-2 Failure Symptoms after Switch-off upon Failure (Part 2 of 2)
5.4 Storing a Fault Code in Memory
Once the Thermo 90 S completes the after run period
(cool down) initiated by a failure event, the current flash
code will be downloaded (stored) in memory.
The Thermo 90 S can store up to four error codes.
Once the memory is “full”, any additional error code will
replace the earliest code stored thereby continually
updating the error codes stored in memory with the four
most recent malfunctions.
5.4.1 Reading and Removing Error Codes
Stored in Memory using the
PC Diagnostics Kit P.N. 92542C
It is possible to read and remove (reset) stored error
codes from the Thermo 90 and Thermo 90 S control unit
memory.
This is achieved through the use of a diagnostic interface
kit connected between the heater and an IBM compatible
computer having the necessary software installed.
The PC Diagnostic Interface Kit comes complete with
interface module and cables, software and instructions
for use.
Order PC Diagnostics Kit under part number 92542C.
Several interface connection adapters are available for
use with various heater models. For this reason,
interface connection adapters are not included in the PC
Diagnostics Kit.
Order the appropriate interface connector for the heater
model(s) you will likely be working with.
For the Thermo 90, order adapter # 83661A
For the Thermo 90 S, order adapter # 92556A
In addition to working with stored fault codes, the PC
Diagnostics Kit allows you to do several other functions
such as reading values while the heater is in operation or
testing individual components. Printing out of fault codes
is also available (user supplied printer required).
For further capabilities and instructions for using the PC
Diagnostics Kit, see the instruction manual included with
the kit.
