What causes high water temperature in my Bosch TW Heat Pump?
High water temperature in your Bosch Heat Pump can be caused by a water temperature limit being closed. This could be due to a stuck limit switch or a sensor that is not securely attached to the line.
What to do if my Bosch TW Heat Pump unit is off on high pressure control?
If your Bosch Heat Pump unit is off due to high pressure control, it could be due to several reasons. If in cooling mode, there may be a lack of or inadequate water flow, the entering water temperature may be too warm, or the condenser may be scaled or plugged. If in heating mode, there may be a lack of or inadequate load-side fluid flow. Also, the unit might be overcharged with refrigerant. In this case, reclaim the refrigerant, evacuate, and recharge with the factory-recommended charge. Finally, there may be a defective or improperly calibrated high-pressure switch.
What to do if my Bosch Heat Pump unit is off on low pressure control?
If your Bosch Heat Pump unit is off due to low pressure control, it could be due to several reasons. If in cooling mode, there may be a lack of or inadequate source-side fluid flow, or the entering water temperature may be too cold. If in heating mode, there may be a lack of or inadequate water flow, the entering water temperature may be too cold, or the condenser may be scaled or plugged. Also, the unit might be low on refrigerant. In this case, check for a refrigerant leak, repair it, evacuate, and recharge with the factory-recommended charge. Finally, there may be a defective or improperly calibrated low-pressure switch.
What to do if there is no or low flow in my Bosch TW?
If you're experiencing no or low flow in your Bosch Heat Pump, consider the following: * Check 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 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.
Why does my Bosch TW Heat Pump short cycle?
Your Bosch Heat Pump might be short cycling due to several reasons. The unit may be oversized, requiring a recalculation of heating and cooling loads. The thermostat might be installed near a supply air grill, in which case you should relocate it, or the heat anticipator may need readjustment. Also, check for a defective or improperly calibrated low-pressure switch.
What does yellow alert flash code 5 mean on my Bosch Heat Pump?
A yellow alert flash code 5 on your Bosch Heat Pump indicates an open circuit. Possible causes include: 1. An open outdoor unit power disconnect. 2. An open compressor circuit breaker or fuse(s). 3. A failed open compressor contactor. Check the contactor wiring and connectors, look for signs of failure (burned, pitted, or open), and check for low pilot voltage at the compressor contactor coil. 4. An open high-pressure switch that requires manual reset. 5. An open circuit in the compressor supply wiring or connections. 6. An unusually long compressor protector reset time due to extreme ambient temperature. 7. Damaged compressor windings. Check the compressor motor winding resistance.
Why is my Bosch Heat Pump not providing enough cooling or heating?
If your Bosch Heat Pump isn't cooling or heating sufficiently, start by checking if the unit is undersized for the space; recalculate heating and cooling loads, and consider adding insulation or shading. Also, the unit may be short of refrigerant charge. Inspect the compressor for defects; if the discharge is too low and suction pressure is too high, the compressor isn't pumping properly and should be replaced. A defective reversing valve can also cause this issue by creating a bypass of refrigerant; replace it if necessary. Compare the unit's operating pressures to the pressure/temperature chart. Check the TXV for restrictions or defects, replacing it if needed. If the refrigerant system is contaminated with moisture or noncondensables, reclaim the refrigerant, evacuate the system, and re...
What causes low heat output in my Bosch TW?
Low heat output in your Bosch Heat Pump can be caused by a scaled or fouled heat exchanger. Clean the heat exchanger to resolve this issue.
What does yellow alert flash code 8 mean on my Bosch Heat Pump?
A yellow alert flash code 8 on your Bosch Heat Pump indicates a welded contactor. This means the compressor contactor has failed closed, or the thermostat demand signal is not connected to the module.
What does yellow alert flash code 7 mean on my Bosch TW Heat Pump?
A yellow alert flash code 7 on your Bosch Heat Pump indicates an open run circuit, with current only in the start circuit. This could be due to an open circuit in the compressor run wiring or connections (check wiring and connectors between the supply and the compressor "R" terminal), or a damaged compressor run winding (check compressor motor winding resistance).
Instructions for mounting the unit on a vibration absorbing pad.
Lists default UPM board parameter configurations.
Details UPM board DIP switch default positions for functions.
Describes UPM features like anti-short cycle, random start, low pressure bypass.
Lists key features of the Bosch water heat pump controller.
Details unit operational modes: Off, Heating, Cooling.
Describes controller protection against faults and ensuring safe operation.
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