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I have a prestige solo 175 and have an e32 erroressage

Customer Question
I have a prestige...

I have a prestige solo 175 and have an e32 erroressage saying dhw sensor shorted and we have no hot water

Contractor's Assistant: How long has this been going on? And how severe is the problem?

It just happened. I have an outside bathroom which the hot water from the shower burst and then this pro problem occurred

Contractor's Assistant: Do you plan on doing the work yourself?

If I can

Submitted: 4 months ago.Category: HVAC
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Customer reply replied 4 months ago
It also says check dhw temperature sensor and wiring harness for a short circuit
Answered in 5 hours by:
12/17/2017
HVAC Technician: Phil, Mechanical Engineer replied 4 months ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,315
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified

Hello.

If you are able to read a wiring diagram find the DHW (domestic hot water sensor) on the diagram, then locate those wires on the printed circuit board....remove both wires and use an ohm meter to check for continuity between the two wires...

.

if you get a read the same as when you touch the two test probes together, follow the wires to the sensor, then unplug the sensor and check for continuity again, if you get the same read then the sort is in the wire itself, run new wire.

If you do not get the same read, then replace the sensor itself.

If you have any trouble with that

Take close up, exceedingly well focused photo's of the wiring diagram glued inside the heaters service access door , that shows where the thermostat wires connect, and I will mark them up with trouble shooting instructions.

Use the 'add files' link next to your send button to get the photo(s) to me.

We can go from there with training, coaching and diagnosis.... without a time limit, In depth with as much detail as needed , after you rate this answer:

Select the 'finish and rate your expert link' near the top of your page and click on it.

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Customer reply replied 4 months ago
Where would I find the dhw sensor?
HVAC Technician: Phil, Mechanical Engineer replied 4 months ago

The sensor is generally clamped to the hot water tube that leaves the heat exchanger inside the unit... the best way to locate it is to first find it on the wiring diagram, then find where it connects on the printed circuit board.... then follow those two wires to it.

.

click here for the service manual

See pages 34-37 for the sensor locations... most are item number 4's... and you want the one located in the hot water line leaving the boiler.

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Phil
Phil, Mechanical Engineer
Category: HVAC
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