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IAQH-1000 Manual
83
PWM blower speed fault
The speed of the PWM blower does not match the
expected speed. More specifically, the blower speed fell
outside of tolerance band 1 (parameter 650.00) for a
time longer than the maximum speed deviation allowed
(parameter 660), or the blower speed fell outside of
tolerance band 2 (parameter 650.01). There are many
possible corrective actions:
1. Increase ramp time up (parameter 522) and/or ramp
time down (parameter 523) to allow the blower more
time to achieve the expected speed.
2. Increase the setting of tolerance band 1 (parameter
650.00) and/or tolerance band 2 (parameter 650.01).
3. Ensure that the maximum fan speed (parameter 519)
and the number of pulses per revolution (parameter 644)
are set correctly for the blower being used.
4. Inspect wiring from PWM blower to LME7 to ensure
the tachometer speed feedback signal is wired
correctly.
138
Restore process successful There is no fault. This fault occurs when a parameter
set was successfully restored from the PME7 program
module to the LME7 base unit. Reset the fault.
139
No program module
detected
This fault occurs when no PME7 program module is
plugged into the LME7 base unit. Insert a PME7
program module into the LME7 base unit and reset the
fault.
167
Manual lockout
A manual lockout is caused by pressing the info button
and any other button, either on the LME7 base unit or on
the AZL23 remote display. Reset the fault.
206
Inadmissible combination of
units (LME7 / AZL23)
Reset the LME7. If the fault occurs continuously,
replace the LME7 and / or AZL23.
225
PWM blower speed fault
The speed of the PWM blower dropped below the
minimum prepurge speed (parameter 675.00) during
prepurge, or the speed of the PWM blower exceeded the
maximum ignition speed (parameter 675.01) during
ignition. Adjust parameter 675.00 or 675.01, or adjust
purge speed (503.01) or ignition speed (403.00).
226
PWM blower
parameterization error
The following parameter settings are not allowed.
Correct the parameter setting that is incorrect and reset
the fault.
1. Speed low-fire (P1) > speed high-fire (P2)
2. Speed low-fire (P0) = 0
3. Maximum blower speed (parameter 519) = 0
75
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