Replacing a GT153 PHE Sensor on a Boilermate 2000

I have a Boilermate 2000 and have recently experienced fluctuating hot & cold water.

Having consulted both this site and the Gledhill manuals, I’ve deduced the fault is with the PHE sensor. This is corroborated by the PHE_T2 error code from the ACB.

I now need to replace this sensor however require some clarity on the following:

1. Should I replace both sensors i,e, PHE & DHW as is typically recommended? The DHW is currently functioning correctly.

2. Do I need to use heat sink compound or is PTFE tape sufficient? Some advise do whereas others don’t. If so, could one be recommended. Existing sensors have some form of heat seal on them.

3. For curiosity; what is the difference between a dry pocket and wet pocket sensor. I understand my BM has dry pocket sensors.

I’m a good diy'er and on a limited budget hence would like to replace the sensors myself.

Many thanks in advance.

Chopper

Ptfe is fine.
Bm 2000 has 2 wet sensors.
DHW sensor turn off water, open taps.
Cover pump etc with towel.
Remove and fit.
PHE sensor is wet on the unit side.
Drain off unit using the DOC near the sensor.
Fill unit and add 1 litre of inhibitor to do a good job.
Mike

Ps;
The only dry sensor you have is the store sensor.
Mike

Thank you kindly to Mike for your time and input.

In the end I sensibly opted to change both sensors including the working DHW sensor which was relatively straight forward.

For the PHE sensor, I decided against draining the system as did not have any inhibitor or the necessary knowledge and time.

Instead I simply followed the instructions as per the DHW change out and although there was a small loss of water all seemed ok when the boiler was fired up.

The PHE error code has now gone and the fluctuating hot/cold water issue cured.

For reference, I found an excellent supplier online (Berhams) who supplied 2 x GT153 for £19.64 each incl. VAT and next day delivery!!!

All seems fine for now so hopefully now problems from hereon.

Well done!