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HAMWORTHY HEATING LTD Page 500001065/B
MARSHALL HE
28
Fig 13 – Fault Finding (page 2 of 2)
Fault
Cause
Remedy
The heating system is unable to
achieve the desired room comfort
level
If the outside temperature compen-
sation function is utilised, the 'slope'
and ‘offset’ settings are incorrect.
Use a lower slope or reduce the
slope offset setting (refer to section
5.2.3 steps 37 to 40)
The maximum flow temperature or
fixed flow temperature set point set-
ting is set too low
Increase the setting (refer to sec-
tion 5.2.3 step 27 or 43)
The room temperature is too high
‘Active’ room comfort level setting
overridden to a higher value.
Reset to correct value (refer to sec-
tion 2.3 of the Marshall HE User’s
Instructions)
Room temperature sensor fault (if
fitted) - sensor reads '??'
Check the room sensor wiring con-
nections at the sensor and within
the Marshall HE controller
If the outside temperature compen-
sation function is utilised, the 'slope'
and ‘offset’ settings are incorrect.
Use a higher slope or increase the
slope offset setting (refer to section
5.2.3 step 20)
The maximum flow temperature or
fixed flow temperature set point set-
ting is too high
Reduce the setting (refer to section
5.2.3 step 27 or 43)
External temperature sensor fault
(if fitted) - external sensor reads
'??' and flow temperature set point
remains constantly at the maxi-
Check the external sensor wiring
connections at the sensor and
within the Marshall HE controller
Summary of Contents for MARSHALL HE
Page 21: ...HAMWORTHY HEATING LTD Page 500001065 B MARSHALL HE 17 Figure 2 Overall Dimensions...
Page 22: ...HAMWORTHY HEATING LTD Page 500001065 B MARSHALL HE 18 Figure 4 Marshall HE System Schematic...
Page 23: ...HAMWORTHY HEATING LTD Page 500001065 B MARSHALL HE 19 Figure 5 Site Wiring Connection Details...
Page 33: ...HAMWORTHY HEATING LTD Page 500001065 B MARSHALL HE 29 NOTES...
Page 34: ...HAMWORTHY HEATING LTD Page 500001065 B MARSHALL HE 30 NOTES...
Page 35: ...Notes...