It is not an easy project. It could be several issues. 1) Heater clogged up. 2) Solenoid valve(s) not working. 3) Pump not pumping.
Here is one thing you can try. Fill the bladder with hot tap water. Try spraying form the hose only. (Do not attach any of the attachments to it. Just spray directly from the hose.) It may take a minute or so but many times it can prime itself and start working after doing this.
If it is any of the problems above this will not fix it.
Answers & Comments
It is not an easy project. It could be several issues.
1) Heater clogged up.
2) Solenoid valve(s) not working.
3) Pump not pumping.
Here is one thing you can try. Fill the bladder with hot tap water. Try spraying form the hose only. (Do not attach any of the attachments to it. Just spray directly from the hose.) It may take a minute or so but many times it can prime itself and start working after doing this.
If it is any of the problems above this will not fix it.