General Protection Mode; Heat Protection Mode - TC Electronic RH450 User Manual

Introduction
The RH450 is equipped with an intelligent protection system,
ensuring that the amp does not suffer or malfunction if operated
wrongly or in extreme environments.

General Protection mode

If the RH450's display indicates "P", the amp is in Protection
mode.
Protection mode is invoked if for some reason a short-circuit
situation occurs. In Protection mode, the speaker outputs are
shut off so that the speakers cannot be damaged by a
shortcut.The balanced output, digital recording out and the
effects loop, however, are still passing audio in Protection mode.
To remedy the problem, try turning off the RH450 for a minute
and then turn it on again. If the display still indicates "P", you will
have to send the RH450 to a qualified service-center for
inspection.
APPENDIX – MISCELLANEOUS

Heat Protection Mode

If the display indicates an "H", the amp is too hot. This is rarely
seen, but a few extreme situations can invoke this mode:
a) If the amplifier is used in an environment that is too hot, or if
proper ventilation is not ensured.
b) Cabinets or combinations of cabinets must load the amplifier
with a minimum of 4 Ohm. A maximum of three RS cabinets
can be used or two 8 Ohm cabinets of any other brand.
If e.g. the speaker output is loaded with only 2 Ohm or less
and you drive the RH450 at very high volumes over a long
period of time, the amplifier enters Heat Protection mode.
In both situations, proceed as follows:
– Turn off the amplifier.
– Solve the issues.
– Allow the amplifier to cool off for a few minutes.
– Turn on the amplifier again.
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