Bosch SM036 User Manual (English)

Other manuals for Bosch SM036

Installation, Operation And Maintenance Manual100 pages

Manual44 pages

Questions and Answers:

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burtonmindySep 12, 2025
How to fix a Bosch Heat Pump that short cycles?
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  Pamela HowardSep 13, 2025
  If your Bosch Heat Pump is short cycling, several factors could be responsible. The unit might be oversized, requiring recalculation of heating or cooling loads. The thermostat's location could be the problem if it's near a supply air grill; try relocating it and adjusting the heat anticipator. Also, check the wiring and controls, specifically looking for a defective or improperly calibrated low-pressure switch.
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Jerry SmithAug 25, 2025
Why is my Bosch SM036 Heat Pump not cooling or heating enough?
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  fschroederAug 25, 2025
  There are several potential reasons why your Bosch Heat Pump might not be providing sufficient cooling or heating. It could be due to an undersized unit (in which case, recalculating heating and cooling loads and adding insulation or shading might help), loss of conditioned air through leaks in ductwork or around doors/windows, inadequate airflow (check and replace the filter if dirty), low refrigerant charge, a defective compressor or reversing valve, operating pressures that don't match the unit's pressure/temperature chart, a restricted or defective TXV, or contamination of the refrigerant system with moisture or noncondensables (in which case you need to reclaim refrigerant, replace the filter dryer, evacuate the system, and recharge with the recommended charge).
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amy26Aug 25, 2025
What to do if my Bosch SM036 compressor isn't working?
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  Julie CoxAug 26, 2025
  If the compressor on your Bosch Heat Pump isn't operating but the fan is running, it could be due to an open compressor overload. Check for supply voltage at the load side of the contactor. For 3-phase models, check the phase rotation and voltage at all 3 phases. Poor wiring connections can also cause this; look for signs of heat on the wiring insulation and ensure that all wiring connections are secure and properly torqued. A burned-out compressor is another possibility; check if the compressor hums when power is applied. If not, check the resistance of the compressor windings using the values shown in the compressor characteristics chart, ensuring the compressor is cool (70° F) when checking the windings.
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Sharon BradleyAug 27, 2025
Why does my Bosch Heat Pump unit shut off on low pressure control?
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  Levi BarreraAug 27, 2025
  If your Bosch Heat Pump shuts off due to low pressure control, it could be caused by several factors. In cooling mode, this may be due to a lack of or inadequate air flow, entering air temperature being too cold, an inoperative blower, a clogged filter, or restrictions in the duct work. In heating mode, it may be due to a lack of or inadequate water flow, entering water temperature being too cold, or a scaled or plugged condenser. Also, the unit could be low on refrigerant, requiring you to check for a refrigerant leak, repair it, evacuate, and recharge with the factory-recommended charge. Finally, check for a defective or improperly calibrated low-pressure switch.
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Ann CrawfordAug 28, 2025
What to do if my Bosch Heat Pump is not running at all?
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  btaylorAug 28, 2025
  If your Bosch Heat Pump isn't running, start by checking the power supply. Ensure the disconnect is closed and power is applied. Inspect for blown fuses or tripped breakers, replacing or resetting them as necessary, ensuring correct fuse size. Verify the voltage supply meets the unit's data plate specifications; if it's low, contact your local power company. Also, examine the thermostat. Set the fan to 'ON' to see if the fan runs. Test 'COOL' and 'HEAT' modes with extreme temperature settings to check for proper operation. If issues persist, confirm 24 volts at the low-voltage terminal strip between 'R' and 'C,' 'Y' and 'C,' and 'O' and 'C,' and between 'G' and 'C' in the air handler. Replace the thermostat if it's defective.
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Frank DuncanSep 9, 2025
What to do if my Bosch Heat Pump has no flow or low flow?
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  Mark JohnsonSep 9, 2025
  If your Bosch Heat Pump experiences no flow or low flow, here's what you can check: * Verify the power supply. * Ensure the on/off switch is in the 'ON' position. * Engage the heat pump contactor. * Repair or tighten any broken or loose wires. * Purge air from the piping system. * Remove the pump cartridge and clean it if the pump shaft/impeller is stuck. * Replace the pump if it is defective. * Repair any kinks in the water piping and check for proper line size.
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Marcus MckaySep 8, 2025
What to do if my Bosch Heat Pump unit shuts off due to high pressure?
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  Amy RodgersSep 8, 2025
  If your Bosch Heat Pump shuts off on high pressure control, it could be due to several reasons. In cooling mode, it could be due to a lack of or inadequate water flow, entering water temperature being too warm, or a scaled or plugged condenser. In heating mode, it may be caused by a lack of or inadequate air flow, an inoperative blower, a clogged filter, or restrictions in the duct work. The unit might also be overcharged with refrigerant, requiring you to reclaim refrigerant, evacuate, and recharge with the factory-recommended charge. Finally, check for a defective or improperly calibrated high-pressure switch.
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Julie Taylor PhDSep 8, 2025
What to do if my Bosch SM036 Heat Pump is short cycling?
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  Tonya CampbellSep 8, 2025
  If your Bosch Heat Pump is short cycling, several factors could be responsible. The unit might be oversized, requiring a recalculation of heating and cooling loads. The thermostat could be installed near a supply air grill, necessitating relocation, or the heat anticipator may need readjustment. Additionally, check for a defective or improperly calibrated low-pressure switch.
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christopherrussellSep 4, 2025
What to do if the fan on my Bosch SM036 Heat Pump isn't working?
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  crystal47Sep 4, 2025
  If your Bosch Heat Pump's ECM constant airflow motor isn't operating, there could be several reasons. First, check for 24 VAC between "G" and "C" and verify all wiring connections, as there may be no fan operation signal. Loose wiring can also cause this issue, so check all wiring connections at the motor and control box, ensuring that power and control harnesses are securely connected. Interface board problems could also be the cause; make sure the interface board isn't damaged and that all DIP switches are in the proper configuration. Finally, a faulty motor could be the problem; check the supply voltage to the motor and ensure all motor wires are secure.
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Dennis PorterSep 2, 2025
Why is my Bosch Heat Pump blowing warm air in cooling mode?
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  Jessica CarterSep 2, 2025
  If your Bosch Heat Pump is providing excessively warm air in cooling or excessively cool air in heating, several factors could be responsible. The airflow might be too high; consult the blower performance table and reduce fan speed if possible. High or low water temperature could also be a cause; check the unit's capacity versus the water temperature. Air leakage in the ductwork can also lead to this issue, so inspect the ductwork. Finally, a loss of refrigeration capacity could be the reason; in that case, check refrigerant pressures with a gauge set.